I have this error : “Unable to detect camera”

You may not be able to operate your camera.

This screen will appear 

Tour browser need to have your authorization to access to your camera.
Check your setting this website is allowed.

• In normal use, your browser show you a small popup close to the URL adress bar. Accept, and refresh the web-page.

 

This icon above, inside url bar, shows your browser has blocked the camera acces

• clic on the icon it to allow
• or go to your browser settings -> authorizations -> allow the url web-page