Video with sound on banner background

Site URL: https://www.auxart.net

I can add a video but the sound will not be read. Is there any CSS code I could use to have a video with audio playing as my banner background? 

Also the video is sometimes not read on mobile devices depending of the browser versions. Any ideas on how I can counter that? 

Thanks very much!

Sarah

Hi @tuanphan

I have the same problem ..

Do you have any solution ?

Thanks,
Lucie