Hello Rikard,
Thanks for helping.
After updating your Theme, the problem still exist. We´ve also updates WordPress to the newest version.
It also can´t be an problem with the cache. If we deactivate the cache, the problem still exist.
The Console does not throw a JavaScript error.
Video and background image is set, exactly like in the English page. Why does it not work for the German one? Is perhaps something wrong with the shortcode generated by our Avia page builder? Can you find any error in the HTML Code that your theme is generating?
Would be great to get help.
Thanks and regards,
Sascha