I had a couple issues in adapting to Zoom for constant business meetings. My office is very narrow, with a bright sunny window immediately behind my head. For months, I just blocked the window with a 30x40" black foamboard.
I've been using a Logitech C920 camera (which I had to get at scalper prices in March), which is OK.
This past week, I got a faster laptop (after several crashes of my old one during video meetings). I got an upgraded camera and a high quality video lamp that stands behind my monitor for facial lighting.
In the picture below, you see the improvements from left to right. Click to enlarge.
I've put the story in a deck in the cloud here.
The light is an Elgato Key Light Air Professional; the camera a Sony VZ-1, and the new laptop a Lenovo Y740 15" with 1 TB SSD, technically a gaming laptop hence a good video chip. Newly released Sony Imaging Edge Webcam software (Windows) allows the camera to directly input video to the PC and Zoom, just like an internal camera or a common C920.
If you invest in a ZV-1, I recommended the Gary Friedman guide to using the camera - here.