Your question is Personalized Footfall Advertising System. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Design a personalized advertising system for a shopping mall when you do not have existing data for users with footfall, using a camera for input and a digital display for output to increase footfall in shops.