Oh yes, I saw that. I should have been more clearer. As far as I know, it is harder to embed YouTube videos in markdown. Either you can embed an image and place it as an hyperlink (so clicking will open the video in a new tab) or using iframe tag. I was just wondering how was this feature implemented in your markdown.

Also, for some reason YouTube embedded markdown files when exported missed out the whole section including video link and text following it.