I'm trying to accomplish something specific:
I want to be able to take one video track and overlay a second video track on top of it. Here's the tricky part (or maybe not), the overlay position and shape needs to move as the video plays.
The main video could be an individual walking down the street and he passes a billboard - the overlay needs to fill the billboard, and presumably change shape/size/position/perspective as the main camera position moves down the street.
I don't need to be spoon fed the instructions, I can probably pick up the concept from some basic pointers. I just basically need to know what this is called, and what software can do it. Can After Effects 7 do this? Is there a better alternative?