Camera setting is also crucial to catch the right moment of subjects at the right time and angel as well .So Using AV ( aperture priority mode ) and selecting f-stop and ISO manually is the most easiest way to set up our camera for street photography .
Needless to say that The camera then decides the shutter speed(exposure). Starting at around f/16 on a bright sunny day with an ISO between 200-400 is a good place to start. If the camera displays a shutter speed higher than 1/200th a second you will be good to go.
Adjustments to the aperture and ISO should be made accordingly after considering the shutter speed that is being displayed by the camera. If we run the risk of capturing a blurry picture if the shutter speed falls below 1/80th. This blur can be removed by simply increasing the ISO and/or choosing a wider aperture. Novice photographers set to the camera to P mode(program or auto) and let the camera select the correct settings. You can still adjust the EV if the shot needs to be over or under exposed.
This proves to be useful if you are shooting run and gun (in a hurry with no time to think), but you do not have much control over what the camera is doing. So it is not always the best option. Program mode does an acceptable job but it is not able to freeze the action in low light where the shutter speed is too slow