1- Create a new basic page and add your youtube URL to the body of the page. When pasting the URL be sure to paste it without formatting (i.e. without a hyperlink, underline, etc.).
2- Add the tag Admin Show Background Video:[VIDEO_SLUG] to the page you want the video to appear. i.e. Admin Show Background Video:celebration
3- You can overlay a quote on the video by adding a headline to the video page.
4- Given background videos are not supported on many mobile devices, you can set a fallback image to use as the background in this section on smaller screens. To do this, simply upload your desired background photo as the social media image for the page.