Thank you so much! It's so silly 
Especially when you don't understand how URL's really work.
So the answer is this: http://octopi.local/webcam/?action=stream
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Hey guys,
I just installed a pi 4 B with octopring using a picam v2. And I cannot get the camera running.
The "control" tab just notes "Webcam stream loading..."
**pi@octopi:~ $ vcgencmd get_camera**
supported=1 detected=1
The log file says
**pi@octopi:~ $ journalctl -u webcamd**
-- Logs begin at Wed 2022-01-05 10:08:57 CET, end at Wed 2022-01-05 10:34:53 CET. --
Jan 05 10:09:01 octopi systemd[1]: Starting the OctoPi webcam daemon with the user specified config...
Jan 05 10:09:01 octopi root[470]: Starting USB webcam
Jan 05 10:09:01 octopi mjpg_streamer[471]: MJPG-streamer [471]: starting application
Jan 05 10:09:01 octopi mjpg_streamer[471]: MJPG-streamer [471]: MJPG Streamer Version: git rev: 5554f42c352ecfa7edaec6fc51e507afce605a34
Jan 05 10:09:01 octopi mjpg_streamer[471]: MJPG-streamer [471]: Using V4L2 device.: /dev/video0
Jan 05 10:09:01 octopi mjpg_streamer[471]: MJPG-streamer [471]: Desired Resolution: 640 x 480
Jan 05 10:09:01 octopi mjpg_streamer[471]: MJPG-streamer [471]: Frames Per Second.: 10
Jan 05 10:09:01 octopi mjpg_streamer[471]: MJPG-streamer [471]: Format............: JPEG
Jan 05 10:09:01 octopi mjpg_streamer[471]: MJPG-streamer [471]: TV-Norm...........: DEFAULT
Jan 05 10:09:01 octopi mjpg_streamer[471]: MJPG-streamer [471]: www-folder-path......: ./www-octopi/
Jan 05 10:09:01 octopi mjpg_streamer[471]: MJPG-streamer [471]: HTTP TCP port........: 8080
Jan 05 10:09:01 octopi mjpg_streamer[471]: MJPG-streamer [471]: HTTP Listen Address..: 127.0.0.1
Jan 05 10:09:01 octopi mjpg_streamer[471]: MJPG-streamer [471]: username:password....: disabled
Jan 05 10:09:01 octopi mjpg_streamer[471]: MJPG-streamer [471]: commands.............: disabled
Jan 05 10:09:01 octopi mjpg_streamer[471]: MJPG-streamer [471]: starting input plugin input_uvc.so
Jan 05 10:09:01 octopi mjpg_streamer[471]: MJPG-streamer [471]: starting output plugin: output_http.so (ID: 00)
Jan 05 10:09:01 octopi mjpg_streamer[471]: MJPG-streamer [471]: Can't enable video in first time
Jan 05 10:09:01 octopi mjpg_streamer[471]: MJPG-streamer [471]: cleaning up resources allocated by input thread
Jan 05 10:09:02 octopi systemd[1]: Started the OctoPi webcam daemon with the user specified config.
any idea, how to solve this problem?
EDIT: solved by replacing camera --> hardware defect
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Thank you! You saved me hours of work!!! My octipi got knocked off by my print head and the jarring caused the camera to come unseated from the camera board.