Write a module for counting passengers

Remote work for a programmer. There's a video camera in the bus. Video from the camera in mp4 format. You need to write a module that will perform the following:
1) Record the time when a new passenger came in and the time when he left (+ if he just went out to miss someone and came back again, he is not considered as new)
(2) Write the calculation in a type file:
Passenger Id: Entry time : exit time
Total passengers:
(3) We count passengers in the cabin + apron of 2 seats (we do not count the driver).