Isn't trespassing, regardless of what you do once you are on private property without permission, already illegal? The video would just be evidence of the crime the person doing the filming committed by being there in the first place. It seems silly that there would need to be a separate law for this.
Some of them trespass, yes, but most of the filming is done from the outside using a powerful zoom lens, or from a drone, or more commonly, by an employee with access to the property.
The Utah Legislature approved a bill in 2012 that made it a class B misdemeanor to trespass on private livestock or poultry operations and record sound or images without the owner's permission.
So this particular law seems like a solution without a problem, given that trespassing for any reason is already illegal.