Try to set a defined width and height for the section that contains the video. that is 100% width and 100vh.
Set Position:Absolute and Z-Index:0 to the background video element and give it a width and height of 100% or whichever unit that will fill the window as desired
Set Z-Index:1 to all other elements i.e. the two dropdowns and the social div so that they are layered above the background video
NB: Do not put other elements inside BG Video element. Arrange them as desired with the main section as the wrapper.
I feel like i’m missing a trick here. I’ve published and now at least we can see something but the + sign has disappeared, the dropdowns don’t open and there is still no video!