1. A computer-implemented method for entity detection, the method comprising: detecting, by a processor, an entity passing through a perimeter of a predefined area based at least in part on camera data; upon detecting the entity passing through the perimeter of the predefined area, classifying, via the processor, a type of the entity from an image of the entity captured by a camera; upon classifying the type of the entity, detecting, via the processor, a feature of the entity from the image of the entity; recognizing the entity, based at least in part on the detected feature of the entity; determining whether the recognized entity was previously assigned an identifier; assigning, via the processor, the identifier to the entity based at least in part on the type and the detected feature of the entity, the identifier distinguishing the entity from another entity of a same type; determining an average length of stay of the entity at the predefined area based at least in part on the determined length of stay of the entity and a previously determined length of stay determined from a previous visit by the entity to the predefined area; identifying the type of the entity as a vehicle, the predefined area being a parking lot; identifying a type of a second entity exiting the vehicle as a human; tracking a location of the second entity; and determining whether the second entity enters a second predefined area.