You could always use your phone or other camera for the hardware verification piece, but be sure to get the process on the web cam. Start recording with your phone (or other camer) and hold the it in such a way that it is capturing the game screen, and it is being capture by the web cam (phone/other screen and game screen). Hold it there for a minute or so, and I think that should tie the two video sources together adequately, and presumably get better video resolution, focus, etc. for what is being capture by the non-webcam video.
I'll defer to Jeremy if that would be acceptable, but I've done that for a couple of my TG score submission runs (and maybe submission(s) here too), and everyone was satisfied that everything was on the up and up, and sufficient information was provided.