Hi ayyoub,
Thanks for contacting us and choosing our product!
About your question with jux background video you can don't worry about video on youtube server because if your video passed all rules of youtube.
The second question about video on local. In old version 1.x we have options to display video from local. However on version 2.x we removed it because it load very slow. So if you really need it please submit a ticket at member area. I'll send it for you!