Thanks, everyone, for your comments. The background is really just a wall, although there’s a difference in lighting coming from a practical so it’s a bit more complicated. Here’s a still I just grabbed from a low quality Quick Time movie.
picture1.png
The clamp is above the shoulder of the girl in the foreground. The branch also makes it a bit tricky..
I could possible scale up the frame, but I’d end up pushing the one girl very close to the edge so I’d rather avoid that. Keyframing it out with a mask, seems like it might just be the best way to go.