Video calls on a Mac mini
How do you set up a Mac mini for video calls?
Mac mini, macOS 11.6
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Setting up video calls on your Mac mini will require that you purchase and install a web camera and a microphone since the mini has neither of these built in.
There are very many cams and mics available. Most cameras and mics will plug into the USB port(s) on the mini.
Here is a webpage at B&H Photo that displays a small selection.
Best Webcam for Mac Mini - B&H Photo Video
If you do a google search or search on Amazon, you can find other examples of webcam kits for the Mac.