Most of the time, when streaming or videoconferencing, I use an IP security camera with pan-tilt-zoom functions. (There's a nifty little piece of software which goes by the clunky name "v4l2loopback" which I was able to use to make this appear to be a local device, for programs such as the Zoom client which don't support grabbing input from the network.) For an event I appeared in commemorating the 50th anniversary of Apollo 13, however, I used a monochrome CCTV camera with plumbicon tube image pickup, NASA surplus property from circa 1970, connected via a cheap USB video capture device.