If you are doing a professional demo video for your website, professional speaker Alfred Poor recommends "...a three-camera shoot: long shot, close-up, and from the side or behind to show audience reaction. Only the close-up needs to be shot by a live videographer; the other two can just be static views on tripods. With good editing, you demonstrate close up expressions, longer view as the audience sees it, and how the audience is reacting to the content."
Three-ing,
Tim Wilson
Professional Speech Coach
Free speaking tips at http://speakingquicktips.blogspot.com
