Senior Android developer with video meeting...

The current app has the live camera video meeting function. I have to add a function to this app. App's new function is this... 1. User1 uploads the video file in the app. then his camera will stop and User2 will watch User1's video file inside User1's camera video. 2. User1 can control his video file(like normal window video player: ex video stop, start, etc) then User2 will watch User1's controlled video. Of course, User1 can also control the video file's audio with video. (ex: If User1 stop his video file on his phone, then User2 will watch the stopped User1's video file) In the current app, the camera live video meeting function is working well now. Regard...