Hi There,
Yes, it’s possible to use a video background in slider.
In this issue, first, you need to upload your video on YouTube, then you could use the YouTube video id as video background in slider.
This is because, the video background only supports YouTube video.
Please follow our provided documentation to customize the theme. You could also watch the video tutorials here: https://www.youtube.com/playlist?list=PLbmIKrgYlRboPSeESLrmeB4i22lVtrvmB
Please note: we had an issue on video background and we already fixed it. In this issue, you need to use our updated theme. Please download the updated theme from Themeforest.
Best Regards,
ThemeLooks Support Team