Sometime in website we need to show the vimeo videos in the background so for that you can use following trick to make it work.

https://player.vimeo.com/video/[your video ID]?background=1

add ?background=1 in the url of embeded code. So it will work like background. No controls will be shown.

Note:
But for this you have to activate this option in vimeo and I think this is available for pro account only.