Quick Test

Shows that Looping header videos work

The above video is a "Header Video slide" widget. This can take a mp4 file for autoplay-looping background videos, or a Youtube/Vimeo URL for a click-to-play video.

The below video is a "Video" widget. The margins can be adjusted in the widget settings so the video display at full screen (normal margin) or at three other sizes.

This widget is a simple "Text" widget with the video embedded into the wysiwyg editor. This will work on all wysiwyg editors.
Click on Media button, then click on the web tab and paste in your Youtube/Vimeo URL.