One option, if you’re trying to keep it on the cheap, is to go get a small camera like this one:
http://www.supercircuits.com/index.asp?PageAction=VIEWPROD&ProdID=4213
…pay the $50 for the camera and plug it directly into the RCA jacks on your camcorder. It’s cheap enough that you won’t feel guilty if you total it, but it is color and has enough of a resolution to give you the rough idea of what’s going on. It’s also tiny, about one cubic inch total, and can be mounted with screws, glues, or whatever to a helmet or surface.
Hope that helps.
