When you go to a studio for taping, have the interview take place in an office setting and be sure that the person who's interviewing you is off-camera and sounds professional. You can either be standing or sitting behind a desk. Dress as you would for an actual job interview.
When the taping is completed, critique your work. Look for unclear speech, repetitious words and phrases, and any mannerisms or gestures that convey nervousness. You must appear relaxed and confident and communicate effectively. If necessary, repeat the interview until you're completely satisfied with it.
Don't mail your video resume to a potential employer without first having obtained permission to do so. When you send your tape, also enclose a cover letter and your written resume. Then follow up with a phone call a few days later.
You'll have the best chance of success with a video resume if you're pursuing a position that requires an outstanding appearance and personality and you have both of these features. Usually, these will be positions that require extensive public contact.