I mean there is no way for me to set video background on my theme 
I'm not new on installing and personalising wordpress themes but this theme is really pissed me off... I just follow the simple steps paste and copy the youtube url but no way to make it run in background... "p.s there is a box where you can select the origin of your video before to paste the link, I've been selected that on youtube too and still not working" but when I paste the previous video url and set that box to "self" as it was before, the video is working... so me, what the hack I am doing wrong? 
Check the video tutorial: 

https://tinyurl.com/y77l5ogj

thank you very much sir...