On some thread here a cyclist had used an EMT conduit hanger as a camera mount. A 1/4 X 20 screw and nut through the hanger mounting hole provided the threaded stud for the camera and computer mouse pad was cut and glued to the inside of the conduit hanger to provide vibration dampening. This required purchasing a hanger larger than what would normally be required for the handlebar.
I friend of mine rides a motorcycle and has a helmet cam attached and always has it recording while riding. He had an accident once, a hit and run, and the insurance adjuster was not going to pay until my friend showed him the video. This maybe an even better option.
http://www.bulletcam.com/