Create a module for existing android social media android application

Current application we have is similar to Instagram. The app displays images and videos of all the user who post. The users are allowed to upload videos only for 20 seconds. What we need: The videos has to play automatically. when the page is scrolled to next video. the previous video has to stop playing, and current visible video has to play. Its is similar to how Instagram plays video. I need only this feature written for me. The webservice is ready. Where you will receive all the images and videos. All you need is to call the web service