Recordings created within a Canvas course can be shared with students in other courses, or guests.
The link can be captured in advance of the meeting, or after the recording is complete and available.
1. Click on the Invite icon.
2. Click 'Get link to copy and paste'
3. Copy the url to post elsewhere in Canvas, or any other means of sharing the link.
Note: The page in item 2. will be different when capturing the link before the live session. Read the article Invite Students & Guests Outside the Course