I believe it would be beneficial to add a video tag for metadata, to enhance the screenshots already part of the specification. Many app stores (such as the Google Play Store, Steam, etc.) provide a means of adding a video, showing the functionality and features of the app. One can provide a quick summary of the app and demo of its use in a short period of time, enhancing the screenshots and description, which can include more detailed information. This makes it easy for potential users to get a feel for an app, and make a better decision on its installation. The Internet is increasingly relying on video for all sorts of needs, I believe this should be no exception.

I would recommend limiting the container and file extension to something such as H.264/MP4, and YouTube links to make it simple to implement for app store developers.

At very least, I hope this opens a discussion on the idea and what may be feasible.