Haven't tried it for video but I use it for drawing reference-https://www.pexels.com
https://images.nasa.gov/
https://coverr.co/
https://wedistill.io/
https://lifeofvids.com
https://mixkit.co
https://archive.org/details/movi…
thanks
Prelinger Archives:https://archive.org/details/prel…
https://mazwai.com/