Function: Retrieves header video settings.

Function: Checks whether a custom header is set or not.

Function: Checks whether the custom header video is eligible to show on the current page.

Function: Retrieves the markup for a custom header.

Function: Prints the markup for a custom header.

Function: Retrieves background image for custom background.

Function: Gets the header image data.

Function: Registers a selection of default headers to be displayed by the custom header admin UI.

Function: Retrieves header image for custom header.

Function: Creates image tag markup for a custom header image.