To apply a video to your background, click on the handle of the section you want to edit then go to the Styles tab and click on Background.
Choose Video for Background type.
Applying a Video to Your Background
Video Link: Add a youtube, vimeo, or MP4 link in the field.
Start Time/End Time: Choose the time at which you want to start and end your video.
Play Once: Click the toggle to play once or multiple times.
Play on Mobile: Choose to play on mobile or not.
Background Fallback: Insert an image to replace the video in case the video does not load.
Next up: Z-Index