Already 
in April Canon released a beta version of the EOS Webcam Utility, which allows the use of compatible Canon EOS or PowerShot cameras as a high quality webcam via USB with a Mac or PC.
Canon EOS R6 as Webcam via Utility
An EOS camera connected to a computer via USB is displayed as a USB camera using the EOS Webcam Utility and can be used as an image source in live streaming or video conferencing programs.
Owners of an EOS camera can thus do without an extra capture box or special commercial software to use their Canon camera as a webcam. The following video explains how to install the software, set up the camera and then explain software such as ZoomZoom in the glossary or use Skype as a webcam in a corresponding online video conference. A version for macOS is in progress and will be released soon.
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Here is the complete list of all compatible Canon cameras (fortunately it has grown by several models compared to the beta version, including the new Canon R5 and R6 models):
EOS DSLR
EOS-1D X Mark III
EOS-1D X Mark II
EOS-1D X
EOS-1D C
EOS 5DS R
EOS 5DS
EOS 5D Mark IV
EOS 5D Mark III
EOS 6D Mark II
EOS 6D
EOS 7D Mark II
EOS 7D
EOS 90D
EOS 80D
EOS 77D
EOS 70D
EOS 60D
EOS 850D
EOS 800D
EOS 760D
EOS 750D
EOS 700D
EOS 600D
EOS 250D
EOS 200D
EOS 100D
EOS 2000D
EOS 1300D
EOS 1200D
EOS 1100D
EOS 4000D
Mirrorless EOS
EOS R5
EOS R6
EOS Ra
EOS R
EOS RP
EOS M6 Mark II
EOS M50
EOS M200
PowerShot
PowerShot G5 X Mark II
PowerShot G7 X Mark III
PowerShot SX70 HS
