I am sure this is updated somewhere but I will post this as it is the #6 hit on google still.
Yes, the UVC cameras will now work with Blueiris! It sucks that I have a mixed model setup now as I needed some IR cameras and could not use these.
UVC Dome Camera with firmware version UVC.v188.8.131.52.a32ae49.160411.03 has a RTSP Stream section under the "Configure" area. In it they put the path at /s0 (rtsp://10.0.0.220:554/s0 for example)
In Blueiris configure the camera as Ubiquiti, Airvision RSTP for model and then /s0 for the path. That with the correct username and password works for me! I did not ensble the "RSTP Authentication" option in the cameras firmware.
Hope that helps somone doing a quick google check.