macOS QT Framework depreciated.

I am still running 10.8 but sent an app to a friend that is running 10.9 and it did not work. It looks like Apple finally did away with the QuickTime Framework. My app scans a drive and creates a NSTableView with poster frames of the videos and can play the video in a QT view.

Doing research yesterday everything is done with AV Foundations from 10.9 and on. I found this Apple youtube video http://www.youtube.com/watch?v=mCiZW2xW4Ks that explains things pretty good, but was wondering if anyone could recommend any good sites that have clear tutorials I could work through to better help me grasp AV Foundations.

Thanks.

It seems that they have introduced a framework called AVPlayerView in 10.9. This seems to make things easier to play back the movie files. But from what I was seeing reading Apple won't allow any app submissions with QT Frame work. So to make any apps backwards compatible would be imposable. Seems like they really want to put QT as far behind them as they can as of 10.9