I have a Logitech c920 with the resolution set to Custom: 1280x720 and my Base (Canvas) Resolution is 1920x1080 (my monitor's native resolution) with the Output (Scaled) Resolution set to 1280x720. For some reason that I cannot determine, the webcam's output does not fill out the screen when I set transform to "Fit to screen" even though 1280x720 is the exact same ratio as 1920x1080. There are still small black bars on the left and the right edges of the screen (though much smaller than if the webcam was outputting at a 4:3 resolution). Here is the coverage I am getting with the webcam.
Also, this is the coverage with the webcam's resolution set to 1920x1080 with Base (Canvas) Resolution also at 1920x1080 and Output (Scaled) Resolution at 1280x720 and the webcam's transform set to Center.
logfile here
Also, this is the coverage with the webcam's resolution set to 1920x1080 with Base (Canvas) Resolution also at 1920x1080 and Output (Scaled) Resolution at 1280x720 and the webcam's transform set to Center.
logfile here