You can make one in the editor by spawning a unit, such as a chicken.
In the box for the chicken that says 'init' (Initialization) type the following:
[] call BIS_fnc_camera;
This will call a built in camera function so you can record the cinematics
Then press 'L' to remove the crosshair, and WASD to move along with numpad to rotate camera!
As for the server, I don't think you can as a standard player. If you need further help, PM Me.