Animations in lesson titles in Rise


I would be very grateful if someone could share some light on how I can customize the background of the title section in each lesson. I know how to do it with the cover photo and that's great, but I would like to make animated background for each lesson/section. I am quite new to the tool, but I have watched the tutorials and searched the dissussion archive and somehow I cannot find relevant info on that. I am interested in something similar made in this course: 


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