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
sudo obs
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
I updated ZorinOS to 16 by fresh install of the OS but i saved my homedir before and restored my settings from this backup!
That why i had a ~/.config/obs-studio dir in my homedir that contains some older settings and files. After removing / purge this dir - a new version has been created after starting OBS again.
But there is still another problem, when starting the virtual webcam OBS ask for sudo password.
Should be working as none root user too.
Any ideas to this behaviour?