I need to participate in some Zoom meetings, and have encountered several problems. My laptop has a perfunctory camera and a rather small screen, so I can't see everyone clearly. My desktop does not have a camera. The good and not exorbitantly priced webcams appear to be all sold out, as are nearly all the webcams listed at B&H. Why not use one of my DSLRs? I have three Nikons that might be suitable, a D5600, a D7200 and a D750. I don't shoot video and have no experience in long videos or connecting the camera's video to an external device. Are there any reasons not to use a DSLR in this way? I will appreciate any guidance.