Where can I find gif on full screen in high quality?

Question

Design

I need a background for the site in the gif extension in good quality, but I can’t find it in any way, I would like to use the gif as in the Yandex browser, but I can’t find it anywhere. I spent half a day, in the answers I'm waiting for links to sources where these can be found or the gifs themselves (preferably with beautiful nature or a city)
I'm looking for this gif, it's from the Yandex browser backgrounds

Answer 1

Video background will weigh many times less and much better.