2020 brought us (among other things) the EOS webcam utility.

Officially the following EOS models are supported:

EOS-1D X Mark II
EOS-1D X Mark III
EOS 5D Mark IV
EOS 5DS
EOS 5DS R
EOS 6D Mark II
EOS 7D Mark II
EOS 77D
EOS 80D
EOS 90D
EOS Rebel SL2
EOS Rebel SL3
EOS Rebel T6
EOS Rebel T6i
EOS Rebel T7
EOS Rebel T7i
EOS Rebel T100

However, I managed to get my 550D (EOS Rebel T2i from 2010) to work with Microsoft Teams and Jitsi (via a webbrowser). Note that the 550D is not on the list, so the supported camera list seems to be just a guideline.

Some points that might help when setting this up:

• After connecting/switching on my camera I had to restart the application that needed the camera (Microsoft Teams and my browser in my case). Only then it showed up as an available camera.
• The instructions state that the camera should be in Movie mode. I found that it also works in other modes.
• In Movie mode I could not turn off the camera screen to save energy. In other modes (e.g. Av) I could.
• Exposure controls work, but only when the camera screen is on. So I now:
  • Connect camera and select it as the active webcam in the application
  • Turn on camera screen
  • Set exposure as desired
  • Turn off the camera screen
  • Start using it as a regular webcam