If you are going to use Iclone props over live video I found it best to place the video as a background as per instructions above, then bring in the props onto the grid and move the props or main prop around until they match the scale, I just eyeball it, it can be a bit fiddly but you will get there in the end, match the lighting and shadows and IBL, add particles etc, the main thing is DO NOT MOVE THE CAMERA angle/perspective, once set only use the prop move tools.
I'm really looking forward to when Mocha is available so we can have camera moves on 3D objects locked into a video background,
Think about it, find a great atmospheric location like a warehouse and film a camera move, then bring into iclone to add more props and avatars, you will save a lot of time and resource memory plus get a real looking set....can't wait'
Below a quick test, I shot.
Neal
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View my latest Iclone project THEY ARE HERE Renegades versus the overlords 