Can one have details about Video Backgrounds? Where can I have details about it?

Video backgrounds can be a great way to improve your website’s look
A video background is inserting a video that covers the entire background like an image.

Basic guidelines include:
Only use a video background if it is really going to improve your site’s look and feel in a positive way. Make sure that it does not make the site slower and less easy to navigate;
Choose a video that is short in length and small in size. You want it to load quick and to enhance your site.
Don’t use sound.

More information can be found at:
https://envato.com/blog/video-backgrounds-web-design-trends-usability-best-practices/