How to Make Viewing the Entire Video in Your Course Necessary

Insert your video into one of the slides of your presentation. To do this, click Video and select Video on My PC in the Insert tab.
Choose a file on your PC and click Insert.
Select the video on the slide and, in the Playback tab, click Start: Automatically.
Disable the video controls. Go to the Slide Show tab and uncheck Show media controls.
Switch to the Insert tab. Add a rectangle shape that covers the entire video object. This will prevent viewers from clicking on the video to stop it.
Right-click on the shape and select Format Shape.
Set it to Solid fill, 100% Transparency, and No line.
Click Slide Properties.
Disable Advance On-Click for the slide with the video. The slide duration should match the duration of the video.
Select limited navigation. To do this, click Player.
Go to Playback and Navigation. Select Limited navigation type and disable keyboard navigation.
Click Bottom Bar. Disable Allow to seek using seek bar and click Apply & Close.

Done! Now your course is ready to be published. Users will be able to advance the slide only after watching the video to the end.