Top bar full width image above header

Hi,
I want to put a top bar with either an image or video in, flush to the top of the screen, above the header. I have the header set to be to the right of the logo now which is good. But I want a colored bar or container above that with an image or video background in it. Widget with an image didn't work, I want it to be full width. Can I do with an element?

Thanks as always in advance.
Laura