You want to use OBS in your Zoom session and integrate it as a local camera:

  1. Install sudo apt-get install v4l2loopback-dkms

  2. Load module sudo modprobe v4l2loopback video_nr=10 card_label="OBS Video Source"

Maybe exclusive_caps=1 is needed for Chromium according to source

  1. Build obs-v4lsink plugin according to README.

Additionally fix wrong destination directory: sudo mv /usr/lib/x86_64-linux-gnu/obs-plugins/v4l2sink.so /usr/lib/obs-plugins/