Hasta La Motion!

i’m thinking of shooting a person walking on a treadmill in front of a green screen. i’m not worried about the setup at the shoot, but i would like more information on how to composite this in post. i’m mainly interested in how do i match up the 3d background to make it look like the actor is actually walking in the environment? since the camera isn’t moving, i’m guessing i won’t do a traditional matchmove? any information anyone has on this would be greatly appreciated.

thanks!