Thanks for that idea.

Actually whoever sets up the Power Point already has the You tube link embedded in the PP slides, but their method is flawed, as clicking that during the presentation takes you to an advertising page for all sorts of stuff!

I have another method to insert a video.  

Use a program called 4K Video downloader, it saves the video, and it can be [as you say] put on a PP slide, - you then do not need an active internet connection.

The post above suggesting Windows-P sounds very easy.