Hi there!
Since the VideoInput has been merged to OpenCv it's possible to get a list of cameras. I spend a good day but didn't find how to do it. Well that is not really important because I can always use a DirectShow for that. What is more important for me is how can i set the input crossbar for a capture device? I'm pretty sure that it's possible due to a cap_dshow.cpp file in sources.
The best scenario would be if I got the VideoInpit access from a CvCapture.