How to setup an expiry popup message for expired media

The Expire Popup option toggles the popup to be displayed on the frontend when the media expires.

For example, when the time expires for a video, the end user will see this message popup

If the end user clicks OK the page will refresh. If the end user clicks Cancel the pop up will disappear but the page will not refresh. 

It is possible end user is watching a video and video completes caching, and the pop up will still appear because the time has expired, however, the video could technically be completed.