How to embed a video from YouTube in the background on Portfolio

You can certainly embed video from YouTube or Vimeo.  See link below for details.

https://help.myportfolio.com/hc/en-us/articles/360036483773-Embed-module

However Portfolio doesn't allow background video for usability reasons.  All video is in the foreground so everyone can access the player controls.

There is no forum for that product here, Portfolio help may be obtained at the links below
https://help.myportfolio.com/hc/en-us/requests/new?ticket_form_id=177168
https://helpx.adobe.com/creative-cloud/how-to/create-portfolio-website.html
https://help.myportfolio.com/hc/en-us
https://portfolio.adobe.com/themes
https://portfolio.adobe.com/
And Lighrtroom Integrations
https://blogs.adobe.com/jkost/tag/portfolio
https://lightroomkillertips.com/getting-images-lightroom-adobe-portfolio-just-got-lot-easier/
https://digital-photography-school.com/create-beautiful-online-gallery-lightroom-classic-cc-adobe-portfolio-15-minutes/