depending on your lighting scheme and how much of a perfectionist you are, you might want to consider rotating your talent rather than your camera. that way, you can just set up the greenscreen opposite your talent, and when he rotates on the spot, the illusion will be that the camera is rotating around him. this won't work with a full-body shot. nor will the lighting be perfect (unless you rotate that too). this is not the ideal way to get the shot, but it is a possible and very cost-efficient way to get close to it. just an option to keep in mind.