The page "Header Image" field populates the header background image.  If a header video is present this image will be the preview image while the video is loading and also serves as the fallback for mobile devices.

The Header Text field will display across the header image as an overlay.

Using the field "Header Video" will replace the background image with a background video. The video must be MP4/h.264 formatted video and should use the standard HD ratio of 16:9.

*NOTE - This is a looping/muted background video so the video should be kept short in size/length (under 30 seconds).

If a rotator is assigned to a page the images will display as slides.  The title and caption or optional and will display as an overlay.   The button uses the Button Text field.