masks

Hi, I am pretty new to vfx.
I filmed my footage standing in an alley looking in the direction of a street (at the end of the alley). I have some cameramovement and tracked everything in boujou and imported it into maya. Now, if i want a cg-car passing on the street, how can I mask the two walls of the alley so the cg is not overlapping the footage(later after 3d-rendering and in compositing)???? Sorry for my english and the bad explanation
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