Go through either discussions, assignments, or pages
Click on Tools, and click on apps. Click view all
Click on Studio from the list of Apps
The Studio library will display. Hover over the video you want to add and click select this
There will be two embed tabs. Click on the video quiz embed tab and click on the quiz drop down menu, select the quiz you want to embed within the Canvas studio media.
Click Embed
You should now see the video and quiz in the Rich Content Editor. You can view the different players tabs, edit details, or remove the Canvas Studio media from the page itself.
When you are ready either hit save to save your changes, or hit save and publish to make it visible to students.