you will have to have a locked down camera for every shot, and nothing can get between the camera and the limb. If you dont wan’t the camera to move then just shoot the environment without anyone in it. If you want to move the camera you will need a motion control camera to capture a clean plate with the camera movement. In both cases you will have to also rotomask the shadow of the leg out of the scene. It is not plug and play, it will take some compositing creativity.