If you like, you can set an introduction video to play each time your showcase is opened. This can be turned on/off from the app if needed.
To set an intro video:
You will need to publish this change in order for it to take effect.
To turn off your intro video in the app:
To stop the video from playing every time you open your showcase, simply open your showcase app.
On the main screen where you see your available showcases, if a showcase thumbnail has a small video box icon - it has an intro video.
Tapping this video icon will turn it off (and you will see a line appear through the icon). To turn it on again, simply tap the icon once more!