In a module area create a new Item or edit an existing item (ignore the other bits).
Select “Mashups>YouTube Video”
If you know the URL of the precise YouTube video you can use that in the Search box, or just search.
Pick your options, usually the embed video looks nicer than the thumbnail
The yellow box shows where the embed will sit in respect to anything else in your item.
Select Submit, That’s it.
Who does this?
The Hit the Ground Running 2018 pages used YouTube embeds and Mediastream embeds (The University in house version of YouTube with less adverts)