If you have a Canon DSLR camera, you can download their webcam utility to plug it in via USB cable. This is handy because you don't need an HDMI capture card! The only problem I have now is I need an A/C adapter for my camera, as the battery only lasts about 1.5 hours.

I found that using my standard zoom lens is fine, the 50mm portrait lens looks better for pictures but that is overkill for a Zoom meeting! Any DSLR camera will blow a webcam out of the water even in low lighting.