You know what just dawned on me. The given here is that this will be a manual management process, i.e. not automatic like tags/categories etc. But you could make a reusable dataset with a HubDB table which can be accessed and queried like tags! With this solution it's scalable, reorganizable and accessible from any Hubspot page, used as custom navigation, tag clouds etc. You could add custom columns to act as filters or types. This could even be scaled into a full on repo site with multi level dynamic pages!
If this is something you would like to look into lets chat!
EDIT:
If you do end up manually having to organize and maintain a table or list do yourself a favor and Google around for a PDF called "Pardot_Setup_Implementation_Worksheet". I've used that doc as a base for documenting and tracking every aspect of our website adn client sites in one place (we use a google sheet).
The other way is the create a new menu called Videos and then add each of the landing pages you want as submenus. Would be more cumbersome than creating a new blog called videos, though.