Is it possible to place a quicktime movie behind footage that I have used the chroma keyer on? For example, I shot a subject against a blue screen, used the chroma keyer, and now want a .mov file to play as the background behind the subject.
Yes. Simply put the footage you want in the background on a lower video layer. Your keyed footage on V2, BG footage on V1. The key will chop out the blue and reveal the footage you have underneath.