Even a sentence or two would help me judge if it's worth my time. If I'm in public and don't have headphones I'm not watching a video, especially if I have no idea what it is. If you tell me why I should care about the video I might make a note to watch it when I get home.
Secondly, I'm not just going to click a random link. I have no idea if it's even relevant or a bot or a troll who just puts the links in every thread they come across.
which would be time intensive
The 5 minutes it would take them to type a quick summary is much less time intensive than the hour it would take everyone who sees the post to watch the videos and see if they care.
And if I know the right way of doing it I already understand why it's better because I want to use it in this situation. Making the students who already understand the lesson do it the wrong way is just a waste of their time.