A lot of states are starting to do it that way. Nevada does but their kicker is that if you want a bonus point you have to pay, if you don't want a point then you don't have to. In Utah you have to purchase a license but if you work it right you only need to purchase one ever two years since the life of the license is 365 days from when you purchase it.
I go to Arizona every year to hunt javelina so I have the license and then I have been buying a bonus point for deer every year for $7.50 but that looks like it is going to change next year since they are revamping the system.
When placing a trail camera don't just look for a well used trail. What you want to do is look for a freshly used trail off by itself that goes from a north facing ridge, thick forest, brushy knob or some other similar bedding area to a food source. Don't forget water sources. Especially in the summer months the deer need water so look for a good trail going down too a creek surrounded by thick cover and place the camera 100 yards up from the water source.
Scent control is very important...