How to make a "timelapse" video with only the confirmed faces of a person?

In the "People" view in the Elements Organizer, there is a "Confirmed faces" section, where only the face of the selected person is displayed. I want to make a video of this part of the pictures, e.g. to show a person's different facial expressions, the aging over time, the change from kid to adult etc. But I don't know how to do it, or if it's at all possible. Any help, tips and tricks, or links would be greatly appreciated.