How To Get Other GameObject's Component Without Manually Drag It And Assign It?

Hi, in my game, I have a player object which has a PlayerControl script component attached with, and I have a camera with a CameraControl script component attached. I want use CameraControl inside the PlayerControl, so far I can only declare

Code (csharp):

1.  
2. public CameraControl camControl;
3.  

And then I assign it through inspector. I just wonder if I can directly get it in my Start() function. such like below:

Code (csharp):

1.  
2. void Start () {
3. camControl = *******.GetComponent<CameraControl>();
4. }
5.  

But I don't know how to define ******* to reach the Camera object as camera object is not a child object of player object