I have a problem with the video background. If I use a video as background there is an error in the browser console (http://cl.ly/image/1y1l2D401p2x) but the video is there and its playing. Another problem is that, if I use the video background the active state of the navigation is jumping from home to the active section If I’am scrolling. I don’t know if the problem is because of the video error. Here a small screen record: http://cl.ly/3h3G3u0O1e2h

Yeah, its a child theme, but If I use the original theme with the video background the 404 Not Found Load Error is still there in the console. Check it out, use a video background and you will see.