Instructors can also view which pages students have clicked on via their access report, which may be an option on your instance of Canvas. The Canvas Guides has a document on this:
How do I view the course access report for an indi... - Instructure Community
This won't tell whether students have actually watched the videos, only that they have clicked on the page. Instructure has another product called Canvas Studio that records how long each user watches each video including which parts of a video each student watches.
Even if there is evidence that students have watched videos, that still doesn't tell whether they have learned anything from those videos. I like to use assignments, whether discussions or quizzes, to assess what students have learned.