Sometimes the web browser will block content such as video from displaying in Canvas or other secure sites. The video will fail to load, either when embedded in a Canvas page or assignment, or on its own. Adjust your browser to enable the video to play.
First, in any browser - verify that the URL showing in the address bar is safe and expected. These will almost always start with https://greathearts.instructure.com/
Step 1 - Click on shield icon in upper left:
Step 2 - Select "Disable Protection on This Page":