glenng Hi
This template does not provide this type of module by default, so customization will be required. Please follow these steps:
1/ Add a new section under the header of the template via the Layout settings, ensuring this section is set to full width.
2/ Create a module (any module that supports YouTube videos) and assign it to the newly created position.
3/ Add custom styles for this video module and set the header to transparent so it covers the video section.
Best regards,