How to install the Video Background Widget
After downloading the video-background .zip from MuseGain.com, just unzip and double click on the .mulib file.
In the library panel you will find a new folder called "Musegain - Video Background".
In this folder you'll find the following widget:
Full customization of your background video.
Create a graphic style for the element in which you want to insert the video background and assign the same graphic style into the widget menu.
Upload the file from the widget menu.
For a full compatibility with all browsers you need to use both Mp4 - WebM videos
Note that you need to insert also a video poster due to the Webkit Policy Restrictions that do not allow Video Background autoplay on mobile devices