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Don't overuse the zoom feature in your invention prototype video. Overuse of the zoom is a sure sign of an amateur. Zooms are usually too fast, cause unwanted camera movement and are not pleasant to watch.
In a movie, television show or commercial, if you see the subject of the shot getting closer, it's probably the camera getting closer to it (a move called a “Dolly Shot”), not the operator using a zoom lens.
The zoom button is best used to frame shots of invention prototypes while the camcorder is paused. If you must move closer to the invention while recording, carefully move the whole camera. The effect is much different and more inviting to watch.