Fullscreen
Responsive background video https://fvsch.com/code/video-background/
Demos
Example
Markup
<div class="fullscreen">
<div class="embed">
<video autoplay loop poster="https://webslides.tv/static/images/peggy.jpg">
<source src="https://webslides.tv/static/videos/peggy.mp4" type="video/mp4">
</video>
</div>
</div>
Source:
modules/_media.scss, line 39