Yep, it depends on the laws in your State.
In Texas you don't need to be a licensed security installation company to install cameras in some situations but you do in other situations.
It all depends upon the purpose of the camera. And it's somewhat of a gray area at best, depending on who's interpreting the law.
If the camera is at a door, as in your situation, you don't need a security license. Although an argument could be made that it is for security purposes.
But if the camera is to prevent theft, such as a camera above the cash register in a convenience store, you must be a licensed installer.
One factor to consider is whether or not a recorder is going to be used. If there is a recorder then it leans toward being a security camera. No recorder leans toward a non-security camera.
There now, it's as clear as mud isn't it?