Do the people and cars in the shot cross behind or in front of your main talent? If so, you’re in for a fun time! You’ll want to read up on how to do rotoscoping in After Effects.
Basically you’ll need to have your non-moving talent on one layer and your fast moving video on one (or more) other layers.
If nothing crosses your main talent, then you could do a really rough mask around them, but otherwise you’re gonna be rotoscoping.
I did this once for a dream sequence in a short film. The talent was running on a pedestrian bridge in slow motion while the traffic and everything below him was flying along at very high speed. We had planned this shot ahead of time so that all we had to do was put the bottom part of the mask along the bottom of the pedestrian bridge so it looked like a seamless shot.
Planning your shot ahead is going to be key. For example, if you’re going to have cars behind your talent and people walking in front of them, you might want to shoot three different passes.
One of your talent with a green screen held behind them.
One of the cars and other background movement.
One of the people who will be walking in front of your talent in front of a green screen.
That way, you won’t have to do too much rotoscoping; you’ll just have to do key out the green screen. (However, if you’re shooting on DV or HDV you’ll run into the famous color resolution issue of keying with those formats.)
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