I have never had broilers but in general I usually feel like most living things can be won over with food.
I use mealworms and sit low and still on the ground a safe distance from the coop and then toss the worms to the chickens. Gradually I throw the worms closer and closer to me, just a little at a time so they have to walk in my direction to eat them. I try to be careful of their tolerance and don't push too much at time. But, generally with a week or so of doing this everyday I can get new chickens to eat out of my hand and climb into my lab to get worms.
Once they are used to you and come to think of you are a yummy treat haver they don't mind you so much.