Any good places to find video-backgrounds?

As the topic says, is there any good sites where I can download small videos to use as fullscreen backgrounds on websites? I mean there are plenty of sites for high quality stock photos… even free, but is there any for videos?

Many stock “photo” sites offer video as well so worth looking around. You could also find licence free resources such as http://commons.wikimedia.org/wiki/Main_Page

Please remember, though, that constantly-moving content can cause difficulties for some users, and you should provide a way to stop the video.

Automatically moving, blinking, or scrolling content that lasts longer than 5 seconds can be paused, stopped, or hidden by the user. Moving, blinking, or scrolling can be used to draw attention to or highlight content as long as it lasts less than 5 seconds.
http://webaim.org/standards/wcag/checklist#sc2.2.2

See also http://www.w3.org/TR/WCAG20/#time-limits-pause