Canvas@Illinois , Managing Course Navigation Links
This page has a link to Canvas documentation
The following contains information on how to hide or show links in the Course Navigation Menu in Canvas: https://community.canvaslms.com/t5/Instructor-Guide/How-do-I-manage-Course-Navigation-links/ta-p/1020
You can use this to add a Kaltura media gallery and My Media, as well as other tools.