The two camera idea is pretty good, but if you are going to go with one camera I will also suggest a mask mounted one. Having watched my share of footage I can honestly say that still shots are great from the marker, but action shots are best from the mask.
Also there are some systems out there that you can put on your real firearm that takes a picture every time you pull the trigger. This would work out great for paintball IMHO.
Good luck and I always enjoy watching good POV paintball footage. It kind of makes you feel as if you are there playing.... even when you can't get out of the house or away from work.
