Best way to match rotoscoped character movements and scaling to different background

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What is the best way to to sync the movement of a rotoscoped character to a new vector based background in After Effects?

Example: Rotoscope a dancing character out of a beach scene and place them in a vector snow background. I want the new background to move and scale like the original scene. Any tips or links to tutorials greatly appreciated.

[Bernd Alheit]

Try the forum for After Effects.