We are using C++ and the USB camera as well. There are a couple of things we have done to get video in the C++ dashboard.
1. Make sure you have the patched widget located here:
http://www.chiefdelphi.com/forums/sh...d.php?t=134404
2. When you start the driver station, start the default dashboard and then make sure you have USB Camera HW selected. You should see video in that dashboard. After you have video working there, switch to the C++ dashboard and add the patched widget to the dashboard.
I believe that will work - that's from memory. Let us know if that works.