You could also have a trigger with one of the following conditions
a) if your the server (hosting the mission) you could use this:
Condition:
IsServer
b) you could also make it so only players with your player name can use it:
Condition:
name player == YourPlayerName
Replacing YourPlayerName with your actuall ingame name.
Then, the activation would simply be
player exec "camera.sqs"
A bit more advanced, but what Surdus Priest said will work - this is just incase you have a reason why they can't press V.. (for some reason).