This is a plugin for stash. It adds a Scan scenes for faces and create thumbnails
task.
It will go through all NOT organized scenes that don't have a stashDB id and no URL set and use the scrubber thumbnail to find image with a performers face and set it as the thumbnail for the scene.
Add the python files too your .stash/plugins
directory
create a virtualenv
virtualenv -p python3 --system-site-packages ~/.stash/plugins/env
source ~/.stash/plugins/env/bin/activate
pip install ~/.stash/plugins/requirements.txt
Rescan the plugins, you will find a new button in the Tasks
sections in the settings.