*You can video tape from an approved area (I've seen it done from the competition area, stands, etc...). The coach or person doing the videotaping cannot coach the athlete upon viewing the footage though. Best bet is to check with the head field official or official at the event to determine what is a legal or illegal area to be video taping.
*This is how I understood the rule, and haven't had issues with officials. If I'm wrong, please correct