Copy and paste the URL for the YouTube video that you want to play in a separate popup window.
Paste that URL into your embed or link code.
After the word “watch” and before the “?” insert “_popup” to the code.
https://www.youtube.com/watch?v=A1PhYOAHgwk
https://www.youtube.com/watch_popup?v=A1PhYOAHgwk