Tons of video content from across UIUC is hosted on Kaltura MediaSpace, from class recordings to your own content.
Kaltura information here.
Front page of UIUC MediaSpace. Log in with your netID and password to access helpful recordings made by your fellow students, staff, and faculty.
You can create your own videos for MediaSpace via Zoom by following these instructions from the iSchool Wiki.
Not everything is published on MediaSpace. If you cannot find what you are looking for, then it might be inaccessible to you.