This article describes what data is tracked from videos on your website.
Umbraco Engage gathers video statistics for the following types of videos:
HTML5 videos (videos provided via the <video> element)
Embedded YouTube videos
Make sure the embed URL contains ?enablejsapi=1 as part of the full URL to enable tracking. The src property of the iframe should be something like: https://www.youtube.com/embed/<CODE>?enablejsapi=1.