A really important thing when it comes to making a video is lighting. Without the proper lighting, there WILL be ugly shadows!
To not have shadows simple take to lamps and place them at the bottom of the wall. Then your actor should step about 1 1/2 feet away from the wall. Finally add a light in front of your actor to counter the back lights.
Done properly, you should not have any shadows in your video.
Watch this video to see the end results. The backing is just a plain looking wall, but with the lighting, it looks studio quality.