Apple Mac mini USB Webcam Recommendations
If you opt for a high-end premium webcam for your Mac mini - like the Logitech Brio 4K HD webcam - you can leverage the higher bandwidth of the USB-C or USB-A connections for full 4K video capture. Prior to the 4K video revolution, USB 2.0 was sufficient for 1080p and 720p HD resolutions. That said, given the demands of 4K, the average Mac mini web camera buyers will be more than happy with the 1080p image and frame-rates of the top selling Logitech model, the C922 Stream Pro.
If your budget is minimal, there's any number of of 2nd-tier 'no-name' knockoff webcams compatible with your Mac mini that may meet your video chat and capture needs for 30 bucks or less. Many of these steal design elements of popular Logitech cameras to look like Logi models, but may not deliver the same image or audio quality. You also won't have access to Logitech's free webcam utility and will need to pay for a 3rd-party app to do any image adjustments.