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MENU: Media > Open Capture Device...

Capture Device tab:

- Video device name:  Select your camera ("FHD Camera" for a CM4x) 

- Audio device name: Select your audio option

- Click the Advanced options (next copyscreens)

Advanced options window (if needed to change some values like the Picture aspect-ratio, etc...) and enable the "Device properties" (to open the next copyscreens):

Device properties (1rst window):

Device properties (2nd window), choose an appropriate Compression format (Color Space / Compression) and resolution (Output Size):

Now you should have the USB stream of your camera on your screen.