Augumented reality project or similar gaming app - repost

hi guys, we have a exhibition where we have an Air conditioner on wall and a screen hanging under it. when a person comes in front of this screen, he becomes visible inside screen through front camera. we see few mosquitoes flying around his head (graphics of mosquitoes can be provided by us). mosquitoes moves around his head and moves whenever he moves his head anywhere in screen, we see a push button on screen left side. when user touches this button. we have to turn ON the AC above and all the graphical mosquitoes flies away outside the screen the idea is to show that AC gets the mosquitoes out . now i dont know how to get this done. i need support from a professional person..URGENT mail me or reply me asap