iOS - How to play a video with transparency?

Question

I recorded a video with a bluescreen. We have the software to convert that video to a transparent background. What\'s the best way to play this video overlaid on a custom

Answer 1

I'm assuming what you're trying to do is actually remove the blue screen in real-time from your video: you'll need to play the video through OpenGL, run pixel shaders on the frames and finally render everything using an OpenGL layer with a transparent background.

See the Capturing from the Camera using AV Foundation on iOS 5 session from WWDC 2011 which explains techniques to do exactly that (watch Chroma Key demo at 9:00). Presumably the source can be downloaded but I can't find the link right now.