Modify Android Source Code (Well-Coded) from Codecanyon

I have a source code of Webview Android App from Codecanyon. Well-coded and documented. It has a lot of feature, like webview, radio, soundcloud, audio rss, tv streaming, wordpress, rss viewer. But I need a simple modifications.
The radio, soundcloud, and audio rss feature has background play and notification manager. What i need is, i want that feature on webview. I have webview with video player from youtube and video html tag, when the video play, it can play as background and has control in notification (like other feature on this app).
Please join if you able to solve this. I will let you know the source code then. Thank you.