@RobertBerger ...
Do you know if your school has purchased the add-on product, Canvas Studio, from Instructure? You would see a "Studio" icon located on the left-hand global navigation menu within your Canvas environment (typically somewhere between your "Inbox" and "Help" icons). Studio is a paid add-on product, so you'd need to talk with your school's Canvas administrator to see if they might have any plans to purchase it. Studio allows for doing screen captures so that you can show your computer screen while talking about your notes, and you wouldn't have to use your webcam to show your face if you didn't want to.
I know there are other softwares out there that could do something similar...though you'd have to record those in a different manner and then either link to them...if they allowed that kind of thing) or upload the video file to your course for your students to view.
Ultimately, you might want to have a conversation with your Canvas admin or someone from your school's Online Learning / eLearning / Distance Education team to see what might be available to you ... or what they would recommend. They may have some other options for you that others at your school have used successfully.
Good luck! Keep us posted...thanks!