Light and audio are weak links. If you are using the on-board camera microphone make sure you get close and have ample light. Make copies of your camera tapes. Share and review them with others. You will be amazed at what you learn.
Video is like fishing.
At times it is intuitive. Often one cannot see or measure its effects. Yet video is powerful. Utilize videotaped assets like chess pieces. Don't play all your cards at once.