So Photobooth has this kind of makeshift green screen technology that involves stepping out of the frame, getting back in, and then Photobooth works out the difference.
I was wondering if it were possible to use that technology in anyway with a prerecorded video. Basically I have a video shot against a plain white background, and I wanna play around with changing it. I do have a shot of just the white background by itself. If it were shot against green or blue I could use iMovie, but unfortunately that's not the case.
I don't think either Photobooth or iMovie can do this on its own, but since the technology basically already exists in Photobooth I'm thinking there must be a way to do this (with maybe another app?)
note: I know you can do stuff like this in Final Cut Pro, but I'm looking for a free or at least relatively cheap solution.