You can play with this tool at:
https://www.tsugi.org/mod/youtube/
key: 12345
secret: secret
You can pre-select the YouTube video using the URL:
https://www.tsugi.org/mod/youtube/?v=53RZQVynmMQ
If you want to use it seriously, please create an account and get your own key and secret, or install and host your own copy of the Tsugi app store with this application.
This work is a simplified version of the Video tracking / commenting Tsugi tool that Clara Nees produced in 2014 as part of an independent study.
https://github.com/cnees/video
Clara's tool built interactivity around a YouTube video using this API:
https://developers.google.com/youtube/iframe_api_reference