Version 3 of the Mason GTM container template has been released. You can find the new version on the Mason GTM Templates page.
The new version adds tracking of user interactions with embedded YouTube videos. Data collected includes play and pause button clicks, video completions, as well as checkpoints for having watched 25, 50, 75, and 95 percent of the video.
You can temporarily find the video test page at: https://masonanalytics.gmu.edu/video-test-page/