thanks for the instruction and the code, it helped out a lot and it's a step in the right direction.
Unfortunately the linked icons/thumbnails are now stuck at the top of the video when entering the page. But I want them to appear/move up by scrolling down (like here: https://lump200.com/).
Also the footer (Imprint/Scroll to top buttom) should appear by scrolling (underneath the icons) on the video background.
The background picture (with the smoke) should not appear on the landing page, just on the subpages.
I'm not quite sure, but I think a need the video as a "real" background on the landing page and not a row background.
Thanks for the help,