Depth of Field
Be aware of ways to increase the sense of depth within your shot, since video images are inherently flat.
If you're shooting someone, try to include other objects in the background or foreground that give the viewer a sense of depth. That way the interview subject won't appear to be just a two-dimensional object on the screen.
Also remember that a wide angle shot will provide a much better depth of field than a telephoto shot where you've zoomed in on your subject.