Startup Idea : Live crowd density finder in public places.

Majority of times we hesitate to go to pubs ,restaurant ,stadiums ,movie theater etc Only because we are unaware of crowd there. We ask many questions before going like:- How many people are already there? Is it too much crowded? Are there nobody who is attending the show ? And if somebody wants to check the density they have to login via android or ios app to authenticate themselves and later they can find the density either using IOT sensors or AI cameras counting number of people or seat layout. Note: Nobody will be able to see human activity or anybody's face.