Eg. White items in the background and white text on top, any issues with text blending into the background are solved.
The HTML5 video tag needs a ‘poster’ attribute, as this will allow browsers that do not support the use of
<video> to fallback to a still image. Yes, Internet Explorer we are looking at you (I guess it would feel weird if IE supported everything!) ;)
This article here gives you all the code you need to achieve HTML5 background video, I found it a fantastic resource.