Camera didn't work for streaming

Hello,

i have trouble with my camera in Zoom Meetings. When I start a Zoom Meeting, my camera is off. When I want to start the camera, I get the message "die videokamera konnte nicht gestartet werden. Bitte wählen sie eine andere Videokamera in den Einstellungen". When I go to the settings, the camera is starting, i see me and can switch the background and all that settings. Then I click on save, and the camera turn off again, and when I click on the camera button, i get the same error message again. I tried all, reinstall Zoom, restart, i checked the data protection settings from Windows, all is ok.

Does anyone have an idea?

Thank you!

Jakob