Replacing the camcorder lens is an expensive proposition. You can get these lenses at any photo store. Unfortunately, many camcorders do not have screw threads on the inside of the lens to allow you to attach the filter. In that case, be careful. If your camcorder does allow you to add lenses and filters, consider getting a wide-angle lens.
Most camcorders come with great telephoto abilities but awful wide-angle capabilities.
Not only do wide-angle shots look really cool, but also they enable you to get really close to your subjects. In addition, by using a wide-angle lens, you can capture an entire roomful of people without having to back up and shoot through a window. Shooting with a wide-angle lens increases your depth of field. That means that almost everything will be in focus and nothing will be fuzzy. In addition, shooting wide angle reduces the jumpy effects of moving and walking.