Video and audio coding

[Windy_i]

I have written programs in Java & C# and am ready to use Python. I would like to write a program to an intercom system in my house that uses both video and audio. I don't know how to:
set up the cameras
send & receive a video stream between specific monitors or how to set up the monitors
ditto for audio
how to address a specific station

Each station (16 total) will have a 7" touch screen monitor, speaker & microphone. The touch screen monitor will handle all user input.

Where can I learn how to accomplish this?

[Larz60+]

for touch screen: https://pypi.python.org/pypi?%3Aaction=s...mit=search
(also can search https://pypi.python.org/pypi)
video: https://pypi.python.org/pypi?%3Aaction=s...mit=search
camera: https://www.raspberrypi.org/blog/picamer...ra-module/
audio: https://pypi.python.org/pypi?%3Aaction=s...mit=search