Some are using mics, mixers, and interface. Others, like me, just using the built-in camera and mic on the laptop. Setting Zoom to allow “original sound” makes the biggest difference. Also turning off automatic volume helps. Some people had audio that sounded o.k., some less than o.k., but everyone had fun! The issues were almost always with the guitar, not the vocals. The camera on my laptop was pretty poor - it’s an old computer. I switched to my iPad after I played and the picture improved significantly. I just ordered a USB HD camera/mic on Amazon, so I’ll be ready for the next one.
As for recording, I believe it was recorded.
Bill, tgo