I'm fairly new to video editing and there is something that seems quite basic that I'd like to do, but a lot of searching in various tutorials and this forum hasn't helped (possible as I don't know what the correct search terms to use are). What I want to do is take a moving shot of the beach with the sea in the background, and replace the sea with something else (maybe woods or whatever, doesn't matter really). I know how to do this using still images but is there a way with moving video? I'd like to pan across the scene and still have the effect.
It would seem a pretty basic thing to do but I'm getting the feeling it actually isn't. I'm guessing that maybe it's something I'd need to do frame by frame. If this is the case, I think I know how but I'd appreciate being told the best function to use for such an effect please.
I have Sony Vegas Movie Studio 9 Platinum Pro.