I know adobe can track the progress of videos. I am wondering is that required to have the video host on the site? Could adobe track the video which is link-in from youTube?
I think this is what you are looking for – Marketing Cloud Help | How to track youtube videos using DTM?
Andrey's linked KB article is still the most current way to track youtube videos.
I just noticed that GTM had a new feature called YouTube Video trigger and video variables in 9/12/2017 release. It is pretty easy to track YouTube videos, I am wondering for DTM, do we have any easy way to track YouTube videos now?
Based on this document, it seems that I will need to add a lot of code onto the page and add code in AppMeasurement.
I am wondering, could I just add code in DTM? In pageload rule? I hope I don't need to involve development team.