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I'm trying to add mediaPlayer to my window for few days but I just can't show it. Qt Designer don't have a option for adding mediaPlayer and I can't add it manually. Any help? Thanks.

Last try:

from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtCore import QDir, Qt, QUrl
from PyQt5.QtMultimedia import QMediaContent, QMediaPlayer
from PyQt5.QtMultimediaWidgets import QVideoWidget
from PyQt5.QtWidgets import (QApplication, QFileDialog, QHBoxLayout, QLabel,
        QPushButton, QSizePolicy, QSlider, QStyle, QVBoxLayout, QWidget)

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(680, 524)
        MainWindow.setStyleSheet("background-image: url(program_background3);")
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.doubleSpinBox = QtWidgets.QDoubleSpinBox(self.centralwidget)
        self.doubleSpinBox.setGeometry(QtCore.QRect(450, 420, 62, 22))
        self.doubleSpinBox.setObjectName("doubleSpinBox")
        self.doubleSpinBox_2 = QtWidgets.QDoubleSpinBox(self.centralwidget)
        self.doubleSpinBox_2.setGeometry(QtCore.QRect(110, 420, 62, 22))
        self.doubleSpinBox_2.setObjectName("doubleSpinBox_2")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(490, 270, 75, 23))
        self.pushButton.setObjectName("pushButton")
        self.widget = QtWidgets.QWidget(self.centralwidget)
        self.widget.setGeometry(QtCore.QRect(0, 390, 681, 20))
        self.widget.setStyleSheet("background: #222;")
        self.widget.setObjectName("widget")
        self.pushButton_2 = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton_2.setGeometry(QtCore.QRect(210, 440, 191, 41))
        self.pushButton_2.setStyleSheet("background: #3D94F6;\n"
"background-image: -webkit-linear-gradient(top, #3D94F6, #1E62D0);\n"
"background-image: -moz-linear-gradient(top, #3D94F6, #1E62D0);\n"
"background-image: -ms-linear-gradient(top, #3D94F6, #1E62D0);\n"
"background-image: -o-linear-gradient(top, #3D94F6, #1E62D0);\n"
"background-image: linear-gradient(to bottom, #3D94F6, #1E62D0);\n"
"-webkit-border-radius: 20px;\n"
"-moz-border-radius: 20px;\n"
"border-radius: 20px;\n"
"border-background: transparent;\n"
"   color: #FFFFFF;\n"
"   font-family: Open Sans;\n"
"   font-size: 20px;\n"
"   font-weight: 100;\n"
"   padding: 40px;\n"
"   box-shadow: 1px 1px 20px 0px #000000;\n"
"   -webkit-box-shadow: 1px 1px 20px 0px #000000;\n"
"   -moz-box-shadow: 1px 1px 20px 0px #000000;\n"
"   text-shadow: 1px 1px 20px #000000;\n"
"   border: solid #337FED 1px;\n"
"   text-decoration: none;\n"
"   display: inline-block;\n"
"   cursor: pointer;")
        self.pushButton_2.setObjectName("pushButton_2")
        self.mediaPlayer = QMediaPlayer(None, QMediaPlayer.VideoSurface)

        self.videoWidget = QVideoWidget()

        self.openButton = QPushButton("Open...")
        self.openButton.clicked.connect(self.openFile)

        self.playButton = QPushButton()
        self.playButton.setEnabled(False)
        self.playButton.clicked.connect(self.play)

        self.positionSlider = QSlider(Qt.Horizontal)
        self.positionSlider.setRange(0, 0)
        self.positionSlider.sliderMoved.connect(self.setPosition)

        self.errorLabel = QLabel()
        self.errorLabel.setSizePolicy(QSizePolicy.Preferred,
                QSizePolicy.Maximum)

        self.controlLayout = QHBoxLayout()
        self.controlLayout.setGeometry(QtCore.QRect(110, 110, 421, 221))
        #self.controlLayout.setContentsMargins(0, 0, 0, 0)
        self.controlLayout.addWidget(self.openButton)
        self.controlLayout.addWidget(self.playButton)
        self.controlLayout.addWidget(self.positionSlider)

        self.layout = QVBoxLayout()
        self.layout.addWidget(self.videoWidget)
        self.layout.addLayout(self.controlLayout)
        self.layout.addWidget(self.errorLabel)

        MainWindow.setLayout(self.layout)

        self.mediaPlayer.setVideoOutput(self.videoWidget)
        self.mediaPlayer.stateChanged.connect(self.mediaStateChanged)
        self.mediaPlayer.positionChanged.connect(self.positionChanged)
        self.mediaPlayer.durationChanged.connect(self.durationChanged)
        self.mediaPlayer.error.connect(self.handleError)
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 680, 21))
        self.menubar.setObjectName("menubar")
        self.menuAdd_video = QtWidgets.QMenu(self.menubar)
        self.menuAdd_video.setObjectName("menuAdd_video")
        self.menuAdd_sound = QtWidgets.QMenu(self.menubar)
        self.menuAdd_sound.setObjectName("menuAdd_sound")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)
        self.menubar.addAction(self.menuAdd_video.menuAction())
        self.menubar.addAction(self.menuAdd_sound.menuAction())

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.pushButton.setText(_translate("MainWindow", "Save As"))
        self.pushButton_2.setText(_translate("MainWindow", "PushButton"))
        self.menuAdd_video.setTitle(_translate("MainWindow", "Add video"))
        self.menuAdd_sound.setTitle(_translate("MainWindow", "Add sound"))
    def openFile(self):
        fileName, _ = QFileDialog.getOpenFileName(self, "Open Movie",
                QDir.homePath())

        if fileName != '':
            self.mediaPlayer.setMedia(
                    QMediaContent(QUrl.fromLocalFile(fileName)))
            self.playButton.setEnabled(True)

    def play(self):
        if self.mediaPlayer.state() == QMediaPlayer.PlayingState:
            self.mediaPlayer.pause()
        else:
            self.mediaPlayer.play()

    def mediaStateChanged(self, state):
        if self.mediaPlayer.state() == QMediaPlayer.PlayingState:
            self.playButton.setIcon(
                    self.style().standardIcon(QStyle.SP_MediaPause))
        else:
            self.playButton.setIcon(
                    self.style().standardIcon(QStyle.SP_MediaPlay))

    def positionChanged(self, position):
        self.positionSlider.setValue(position)

    def durationChanged(self, duration):
        self.positionSlider.setRange(0, duration)

    def setPosition(self, position):
        self.mediaPlayer.setPosition(position)

    def handleError(self):
        self.playButton.setEnabled(False)
        self.errorLabel.setText("Error: " + self.mediaPlayer.errorString())

from PyQt5.QtMultimediaWidgets import QVideoWidget

if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

I've removed all stylesheet values that don't exist and changed your menu to toolbar buttons with actions.

from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtCore import QDir, Qt, QUrl
from PyQt5.QtMultimedia import QMediaContent, QMediaPlayer
from PyQt5.QtMultimediaWidgets import QVideoWidget
from PyQt5.QtWidgets import (QApplication, QFileDialog, QHBoxLayout, QLabel,
        QPushButton, QSizePolicy, QSlider, QStyle, QVBoxLayout, QWidget, QMainWindow)
 
class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(680, 542)
        MainWindow.setStyleSheet("background-image: url(program_background3);")
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.doubleSpinBox = QtWidgets.QDoubleSpinBox(self.centralwidget)
        self.doubleSpinBox.setGeometry(QtCore.QRect(450, 450, 62, 22))
        self.doubleSpinBox.setObjectName("doubleSpinBox")
        self.doubleSpinBox_2 = QtWidgets.QDoubleSpinBox(self.centralwidget)
        self.doubleSpinBox_2.setGeometry(QtCore.QRect(110, 450, 62, 22))
        self.doubleSpinBox_2.setObjectName("doubleSpinBox_2")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(540, 450, 75, 23))
        self.pushButton.setObjectName("pushButton")
        self.widget = QtWidgets.QWidget(self.centralwidget)
        self.widget.setGeometry(QtCore.QRect(0, 0, 681,420))
        self.widget.setStyleSheet("background: #222;")
        self.widget.setObjectName("widget")
        self.pushButton_2 = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton_2.setGeometry(QtCore.QRect(210, 440, 191, 44))
        self.pushButton_2.setText("Push Button")
        self.pushButton_2.clicked.connect(self.clickBtn)
        self.pushButton_2.setStyleSheet("background: #3D94F6;"
"background-image: linear-gradient(top, #3D94F6, #1E62D0);"
"border-radius: 20px;"
"color: #FFFFFF;"
"font-family: Open Sans;"
"font-size: 20px;"
"font-weight: normal;"
"padding: 10px;"
"border: solid #337FED 1px;"
"text-decoration: none;")

        self.pushButton_2.setObjectName("pushButton_2")
        self.mediaPlayer = QMediaPlayer(None, QMediaPlayer.VideoSurface)
 
        self.videoWidget = QVideoWidget()
        self.videoWidget.setStyleSheet("background: #3D94F6;")
        self.videoWidget.setGeometry(QtCore.QRect(10, 10, 420, 350))
 
        self.openButton = QPushButton("Open...")
        self.openButton.clicked.connect(self.openFile)
 
        self.playButton = QPushButton()
        self.playButton.setEnabled(False)
        self.playButton.clicked.connect(self.play)
 
        self.positionSlider = QSlider(Qt.Horizontal)
        self.positionSlider.setRange(0, 0)
        self.positionSlider.sliderMoved.connect(self.setPosition)
 
        self.errorLabel = QLabel()
        self.errorLabel.setSizePolicy(QSizePolicy.Preferred,
                QSizePolicy.Maximum)
 
        self.controlLayout = QHBoxLayout()
        self.controlLayout.setGeometry(QtCore.QRect(10, 6, 421, 30))
        #self.controlLayout.setContentsMargins(0, 0, 0, 0)
        self.controlLayout.addWidget(self.openButton)
        self.controlLayout.addWidget(self.playButton)
        self.controlLayout.addWidget(self.positionSlider)
 
        self.layout = QVBoxLayout()
        self.layout.addWidget(self.videoWidget)
        self.layout.addLayout(self.controlLayout)
        self.layout.addWidget(self.errorLabel)
        
 
        self.mediaPlayer.setVideoOutput(self.videoWidget)
        self.mediaPlayer.stateChanged.connect(self.mediaStateChanged)
        self.mediaPlayer.positionChanged.connect(self.positionChanged)
        self.mediaPlayer.durationChanged.connect(self.durationChanged)
        self.mediaPlayer.error.connect(self.handleError)
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QToolBar(MainWindow)
#        self.menubar.setGeometry(QtCore.QRect(0, 0, 680, 21))
        self.menubar.setObjectName("menubar")

        self.menuAdd_video = QtWidgets.QAction("add video", triggered = self.add_video)
        self.menuAdd_video.setObjectName("menuAdd_video")
        self.menuAdd_sound = QtWidgets.QAction("add sound", triggered = self.add_sound)
        self.menuAdd_sound.setObjectName("menuAdd_sound")

        MainWindow.addToolBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)
        self.menubar.addAction(self.menuAdd_video)
        self.menubar.addAction(self.menuAdd_sound)
 
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def clickBtn(self):
        self.statusbar.showMessage("Button clicked", 0)

    def add_video(self):
        self.statusbar.showMessage("add video", 0)

    def add_sound(self):
        self.statusbar.showMessage("add sound", 0)

    def openFile(self):
        fileName, _ = QFileDialog.getOpenFileName(self, "Open Movie",
                QDir.homePath())
 
        if fileName != '':
            self.mediaPlayer.setMedia(
                    QMediaContent(QUrl.fromLocalFile(fileName)))
            self.playButton.setEnabled(True)
 
    def play(self):
        if self.mediaPlayer.state() == QMediaPlayer.PlayingState:
            self.mediaPlayer.pause()
        else:
            self.mediaPlayer.play()
 
    def mediaStateChanged(self, state):
        if self.mediaPlayer.state() == QMediaPlayer.PlayingState:
            self.playButton.setIcon(
                    self.style().standardIcon(QStyle.SP_MediaPause))
        else:
            self.playButton.setIcon(
                    self.style().standardIcon(QStyle.SP_MediaPlay))
 
    def positionChanged(self, position):
        self.positionSlider.setValue(position)
 
    def durationChanged(self, duration):
        self.positionSlider.setRange(0, duration)
 
    def setPosition(self, position):
        self.mediaPlayer.setPosition(position)
 
    def handleError(self):
        self.playButton.setEnabled(False)
        self.errorLabel.setText("Error: " + self.mediaPlayer.errorString())
 
from PyQt5.QtMultimediaWidgets import QVideoWidget
 
if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

---

Qt Designer uses a lot of setGeometry, I use setGeometry for the main Window only.

If you want to learn it better don't use Qt Designer.

here's a simple example without using designer

from PyQt5.QtGui import QIcon, QFont
from PyQt5.QtCore import QDir, Qt, QUrl, QSize
from PyQt5.QtMultimedia import QMediaContent, QMediaPlayer
from PyQt5.QtMultimediaWidgets import QVideoWidget
from PyQt5.QtWidgets import (QApplication, QFileDialog, QHBoxLayout, QLabel, 
        QPushButton, QSizePolicy, QSlider, QStyle, QVBoxLayout, QWidget, QStatusBar)

class VideoPlayer(QWidget):

    def __init__(self, parent=None):
        super(VideoPlayer, self).__init__(parent)

        self.mediaPlayer = QMediaPlayer(None, QMediaPlayer.VideoSurface)

        btnSize = QSize(16, 16)
        videoWidget = QVideoWidget()

        openButton = QPushButton()
        openButton.setToolTip("Open Video File")
        openButton.setStatusTip("Open Video File")
        openButton.setFixedHeight(24)
        openButton.setIconSize(btnSize)
        openButton.setFont(QFont("Noto Sans", 8))
        openButton.setIcon(QIcon.fromTheme("document-open"))
        openButton.clicked.connect(self.openFile)

        self.playButton = QPushButton()
        self.playButton.setEnabled(False)
        self.playButton.setFixedHeight(24)
        self.playButton.setIconSize(btnSize)
        self.playButton.setIcon(self.style().standardIcon(QStyle.SP_MediaPlay))
        self.playButton.clicked.connect(self.play)

        self.positionSlider = QSlider(Qt.Horizontal)
        self.positionSlider.setRange(0, 0)
        self.positionSlider.sliderMoved.connect(self.setPosition)

        self.statusBar = QStatusBar()
        self.statusBar.setFont(QFont("Noto Sans", 7))
        self.statusBar.setFixedHeight(14)

        controlLayout = QHBoxLayout()
        controlLayout.setContentsMargins(0, 0, 0, 0)
        controlLayout.addWidget(openButton)
        controlLayout.addWidget(self.playButton)
        controlLayout.addWidget(self.positionSlider)

        layout = QVBoxLayout()
        layout.addWidget(videoWidget)
        layout.addLayout(controlLayout)
        layout.addWidget( self.statusBar)

        self.setLayout(layout)

        self.mediaPlayer.setVideoOutput(videoWidget)
        self.mediaPlayer.stateChanged.connect(self.mediaStateChanged)
        self.mediaPlayer.positionChanged.connect(self.positionChanged)
        self.mediaPlayer.durationChanged.connect(self.durationChanged)
        self.mediaPlayer.error.connect(self.handleError)
        self.statusBar.showMessage("Ready")

    def openFile(self):
        fileName, _ = QFileDialog.getOpenFileName(self, "Open Movie",
                QDir.homePath() + "/Videos", "Video Files (*.mp4 *.flv *.ts *.mts *.avi)")

        if fileName != '':
            self.mediaPlayer.setMedia(
                    QMediaContent(QUrl.fromLocalFile(fileName)))
            self.playButton.setEnabled(True)
            self.statusBar.showMessage(fileName)
            self.play()

    def play(self):
        if self.mediaPlayer.state() == QMediaPlayer.PlayingState:
            self.mediaPlayer.pause()
        else:
            self.mediaPlayer.play()

    def mediaStateChanged(self, state):
        if self.mediaPlayer.state() == QMediaPlayer.PlayingState:
            self.playButton.setIcon(
                    self.style().standardIcon(QStyle.SP_MediaPause))
        else:
            self.playButton.setIcon(
                    self.style().standardIcon(QStyle.SP_MediaPlay))

    def positionChanged(self, position):
        self.positionSlider.setValue(position)

    def durationChanged(self, duration):
        self.positionSlider.setRange(0, duration)

    def setPosition(self, position):
        self.mediaPlayer.setPosition(position)

    def handleError(self):
        self.playButton.setEnabled(False)
        self.statusBar.showMessage("Error: " + self.mediaPlayer.errorString())

if __name__ == '__main__':
    import sys

    app = QApplication(sys.argv)

    player = VideoPlayer()
    player.setWindowTitle("Player")
    player.setGeometry(0, 0, 600, 400)
    player.show()
    sys.exit(app.exec_())