How to nail the footer to the bottom if the background of the page with absolute positioning?

Good afternoon.

Previously used raznyie ways and they helped, but in this situation, when the background I have a mix of video and pictures and they are given position: absolute nothing I know of ways does not work( maybe somewhere something I missed, please help. It is very highly desirable that the method did not depend on the height of the footer because on different resolutions it changes.
Codepan:
codepen.io/foxer1/pen/OXbYrj
July 8th 19 at 11:47
1 answer
July 8th 19 at 11:49
it does not work, tried.. - ara_Crooks commented on July 8th 19 at 11:52
or rather it works, but moves the footer to the bottom of the visible area, but if you scroll down it stays in place - ara_Crooks commented on July 8th 19 at 11:55

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