Shake camera up and down when running?

Hello,

I have a big problem. I tried searching for an answer but didn´t find any that could help me.

I would like to "shake" the camera up and down when my character is running, and the faster he´s running the more should the camera shake. I´m not sure how to explain it, maybe almost like Gears of War when your holding A and running.

I have built a script to use a Xbox 360 controller, as show below, but I can´t make i shake when I´m running. Could someone please help me? I´m using C# and not javascript.

// Script

using UnityEngine; using System.Collections;

public class scr_controller : MonoBehaviour {

 public float speed = 10;
 public float runSpeed = 20;
 public float rotateSpeed = 100;

 public Transform camera;

 // Use this for initialization
 void Start () 
 {
         
 }
 
 // Update is called once per frame
 void Update () {
     
     
     // Movment
     float antToRotate = rotateSpeed * Input.GetAxis("HorizontalRight") * Time.smoothDeltaTime;
     float antToRotateVert = rotateSpeed * Input.GetAxis("VerticalRight") * Time.smoothDeltaTime;
     float antToMove = -speed * Input.GetAxis("Vertical") * Time.smoothDeltaTime;
     float antToSideStep = speed * Input.GetAxis("Horizontal") * Time.smoothDeltaTime;
     
     if (Input.GetButton("R_Trigger"))
     {
         Debug.Log("Press R_trigger");
         antToMove = -runSpeed * Input.GetAxis("Vertical") * Time.smoothDeltaTime;
         antToSideStep = runSpeed * Input.GetAxis("Horizontal") * Time.smoothDeltaTime;
     }
     
     transform.Translate(Vector3.forward * antToMove);
     transform.Translate(Vector3.right * antToSideStep);
     transform.Rotate(Vector3.up * antToRotate);
     camera.Rotate(Vector3.left * antToRotateVert);


 
 }
 

}