We can have animated webp's or gifs as well as video backgrounds (this one is in the site, which has it's issues but this one is only 4mb - unsuitable for the home page). The next one below has video pulled from Youtube.

200w-1

A webp Fome the cat - just 45k

and a 131k walky bird...

background video from Youtube with a webp colour dot sequence with a fade added

20k color dots

some text above with parralax on scroll

ok200w

and some below

to see

the effects