For example, if an account has 64 cameras and you want to exclude 3 indoor cameras named Lobby, Storage Room, and Kitchen, then the Hook's query would be:
NOT Lobby NOT "Storage Room" NOT Kitchen
Alternatively, you can enumerate the cameras that you do want to trigger Hook callbacks, but when the camera count is high, it's easier to exclude the smaller count of excluded cameras using the NOT operator.
p.s. Note that the camera names are case-sensitive and that multi-word camera names must be in double quotes currently.