DTM is a tool that allows you to do things faster. We can track HTML5 videos using event based rules in DTM. However it doesn't have any out of the box functionality to track videos provided by other video providers (Brightcove, Youtube, Vimeo, VideoJS, Flowplayer, etc.)
If someone uses the video service that has some sort of JavaScript API (Brightcove, Youtube, Vimeo, VideoJS, Flowplayer, etc.), we can use DTM to add the API code to listen for the different video events. It is required to load the code you need in a page load rule or App measurement or s_code file (make sure it loads at the correct spot, i.e. page top or page bottom), and that will setup the API and/or listeners to track the videos. Then we have to define what we want to do when it comes to capturing and sending the video data. We can use the Media Module implementation which won't require any additional settings in DTM.
Check out this article for the detailed implementation procedure here - https://helpx.adobe.com/dtm/kb/how_to_track_youtube_videos_using_DTM.html
Also, for DTM implementation related queries you can visit our dedicated DTM forum - http://help-forums.adobe.com/content/adobeforums/en/marketing-cloud-forum/activation.html
