If you draw the rectangle where you want it and then move along the timeline (as the number plate moves for instance) land at the point you want it to move, right click select all click one of the corners and drag it to the new position. You can also move any point individually too of course. This evening I will post up a clip using this technique to have a girls face in colour with a b/w background as I walked around her. Lots of keyframing and effort involved......
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