how do i create average of 1000 frames per second from video with yolo

[Rupen_gurung]

Hi i am trying to create a dataset form a vvideo to try out with yolo for object detectation but the problem is i couldn't find a way to reduce the reading of frames per second to average of 1000 for example only 1 frame should be written out of 1000 because the video is very long i want to read only 1 frame out of thousand how can i do that please help And thank you in advance.