Cli usage
You can also us a cli command. If you installed the package via setuptools, the command youtubetobibtex should be accessible:
youtubetobibtex https://youtube.com/watch?v=LkH2r-sNjQs secret
You can also directly use the cli.py script:
python3 youtubetobibtex/cli.py https://youtube.com/watch?v=LkH2r-sNjQs secret