In the USA, anyone is allowed to photograph, video, or otherwise record anything they can see from a public sidewalk, subject to some soft restrictions like it being illegal to impede the movement of others. Any attempt by law enforcement or others to restrict this would likely fail in the courts.
Folks can get pretty upset by this in the real world.
The story is about a person on private grounds. They could talk to the owner and ask them to make a rule about no filming, but the owners probably like filming because if a cut goes viral on their airsoft grounds, it's like free advertising.
In the USA, anyone is allowed to photograph, video, or otherwise record anything they can see from a public sidewalk, subject to some soft restrictions like it being illegal to impede the movement of others. Any attempt by law enforcement or others to restrict this would likely fail in the courts.
Folks can get pretty upset by this in the real world.