can upfront put a youtube video over a background pic?

hello.

so on this site i'm trying to stick a youtube video over a background picture of a drive-in theatre / movie theatre. how do i make upfront stick a youtube video over another picture, without it freaking out when it gets shuffled around for responsive views?

i kinda think i can't use the background picture as a background picture of the section, as then it will get reshuffled. can i "group" the image and the video?
how do i tell one to be behind the other?