I have installed OBS-Studio 27.0.1 by repo following this instruction
I have installed ffmpeg and the dkms module
sudo apt install ffmpeg
sudo apt install v4l2loopback-dkms
After that i added my user to the "video" group
sudo usermod -a -G video MY-USERNAME
After that i restarted Zorin.
OBS is installed and listed in the Main Menue. Starting OBS opens the OBS Windows for a few seconds and then the windows closed.
I started OBS by terminal with
OBS now runs without problems.
Starting obs by normal user delivers
Attempted path: share/obs/obs-studio/images/overflow.png
Attempted path: /usr/share/obs/obs-studio/images/overflow.png
info: adding 42 milliseconds of audio buffering, total audio buffering is now 42 milliseconds (source: Mic/Aux 2)
error: v4l2-input: /dev/video0: select timed out error: v4l2-input: /dev/video0: failed to log status Speicherzugriffsfehler