How do I manipulate the camera?

function player()
repeat wait() until game.Workspace.CurrentCamera 
local cam = game.Workspace.CurrentCamera
cam.CameraSubject = game.Workspace.Part 
cam.CameraType = ("Attach")
cam.FieldOfView = 50
end

game.Players.PlayerAdded:connect(player)

It should follow a brick that I've put into Workspace. It works in studio, but not when I actually play. I'm also new to controlling the games' camera and this site Help?