Like hillbilly said, it depends how you use them. If cameras along the trails are sending you pics real time as you are in the stand, that's not fair chase. Scouting before a hunt may be.
What would it possibly matter if the camera sends me a pic? I'm going to see him when he gets there. Nothing else matters.
It would give you a heads up if the deer is approaching or may spur you to move to intercept the deer. Neither of which would fall under fair chase. For the same reason you cannot fly and hunt the same day in many places.
IF you moved, it would be more fair anyway. Instead of sitting in a tree. Is a picture any different than a buck grunting before it would be in view? Should it be legal to watch a deer cross a field with two eyes, then go get upwind to intercept it? Flying is another ball game. I can't fly.
This is the scenario that makes it not fair chase. You're sitting in a ladder stand early one morning and your cellular trail cam send you a picture. You see a big buck heading north away from you along a fresh scrape line. You know with the direction he is heading you can get down and cut him off at a fire break a few hundred yards away. That's not fair chase. You were aided by the camera. Using your own ears and eyes to hear that grunt or see the flash of a tail is the essence of fair chase.
No different than if you see him cross the road in front of your truck going in and you loop around to do it. Or a half mile off with 2 eyes. The camera doesn't have a gun attached to it. Your own skills have to accomplish the feat, regardless. I know where most deer are without seeing them anyway.
The essence of fair chase is using your own senses to harvest the animal unaided. As long as its legal you can do whatever you want. I don't have any issue with how you want to hunt. But that's not the same issue as is it "fair chase". As it was taught to me in my Georgia hunters education, it would not be.
Fair chase went out the window with baiting. Cameras don't attract deer.
