Zoom Black Screen and 100% CPU

Hey Everyone!
I've tested the notebook's camera, the Logitech C922 and the Canon Rebel SL3 and nothing. Zoom recognizes the cameras, but the screen is black. If I move a window, the image appears, but as soon as I let go of the window, it turns black again. What to do to resolve? Also, when I start the meeting on Zoom the CPU goes to 100%.