Since Hubs are not templates, they cannot be associated anywhere.
However, embedding or sharing them separately is possible.
Hubs are used for different use cases, such as:
To showcase your videos in a series of well-organized, branded, and non-distracting websites.
This feature comes in handy when looking for an explainer video for support, customer testimonials for sales, or internal use by employees.
Note: You may also update those videos anytime, and the changes are reflected in the embedded videos as well.