Does Video Background work on mobile?
Yes, Video Background will work on mobile on all modern mobile browsers.
However, older devices dropped support of video auto-playing so the app won't generally work on old versions of Android Browser (deprecated on Android 4.4 on Sep 2013) and iPhone (version 6 with iOS version 9 or earlier).
On the other, you can enable or disable the Video Background on mobile from the app preferences page.
To find this option, please go to the app preferences page and click on Preferences.
In the next page, in the part where it says Optional preferences, you will find the option to enable or disable the Mobile view for the video.
Please note that the thumbnail will be displayed even if this option is disabled.