How can I add YouTube video to a strip?
As a background
Hey there!
If you’re looking to add a video background using a Youtube video URL that automatically plays when someone visits your site to a strip, this isn’t currently supported . (Thanks for the great request! #FeatureRequest #WixEditor)
However, if you would like to have a video background for a strip that doesn’t automatically play once the page loads, you can achieve this using Wix Video 
Here’s how:
1) Add a ‘Single Video Player’ and select the ‘Strip’ option
2) Inset the Youtube URL at the bottom. Voila!
I hope this helps