Skateboarding can be a fast, action, sport. Fast action and high compression video do not get along.
Lenses come in "zoom" multipliers. Bigger zoom has a number greater than 1 - usually 10x, 12x, 20x, etc. Wide angle will be less than 1. A slight wide angle view with only a little distortion . about 0.75x. Some fisheye gets to 0.50x and extreme fisheye would approach 0.25x. Fisheye lenses are not exactly for close-up video capture but that is possible... for good, close-up, work, that requires "macro-lens" capability. Fisheye lenses are designed to provide very wide-angle views causing a distortion of the view.
Adding lenses to a camera or camcorder means one of two things. If the camcorder has the specification of "Lens Filter Diameter" or "Filter Diameter", that means it has threads that allow screw-mounting filters... or lenses. Most of the low-end cams do not have this spec (hence, no threads for mounting anything). *Some* of these cams with no threads have third party slide-on or snap-on lens capability - but that is very hit-and miss.
Inexpensive lenses are usually made of plastic. Expect distortions, scratches after use and a host of other problems. Good quality glass is expensive to make. Good, glass, lenses can be very expensive - but will resist scratching and will be heavier than plastic lenses. It is important that the mount be very sturdy so the optics off the added lens and the existing lens on the camcorder line-up properly. Screw-mount and bayonet mount are typically more secure than snap-on.
What are your plans for audio? What are your requirements for lighting conditions?
Summary of what the above says your camcorder or camera-to-be should have:
* Low compression video capture.
* Lens filter diameter spec.
Before a camcorder suggestion is made, establish a budget. $100, $500, $1,000, $2,000? More? When we know this we find out what, if any, compromises we need to make.
Im looking for a video camera mainly for purposes of filming skateboarding. i would like to also purchase a fisheye lens for close up filming. As i don't know much at all about camcorders, i would like to learn more about them and i would also like to know what im looking for in terms of quality of video and other features. some information on what lens i am looking for would also be extrememely helpful. thank you