Vibrate the camera this component is attached with. Call it from other component (attached to the same camera): GetComponent<CameraVibrator>().Vibrate();

CameraVibrator.cs

using UnityEngine;
using System.Collections;

/* by FVS - HaLuan */

public class CameraVibrator : MonoBehaviour
{

    new Camera camera;

    [SerializeField]
    float duration = 2.0f;

    [SerializeField]
    float amplitudeMax = 0.5f;


    float originalY;
    float amplitude = 0;
    float phase = 0;
    float angularSpeed = 90;
    float phaseInitial = 90;
    float amplitudeRestoreSpeed = 1f;


    void Awake()
    {
        ///
        camera = GetComponent<Camera>();

        ///
        amplitudeRestoreSpeed = amplitudeMax / duration;

        ///
        return;
    }

    public void Vibrate()
    {
        ///
        amplitude = amplitudeMax;
        phase = phaseInitial;
        originalY = camera.transform.position.y;
    }

    // Update is called once per frame
    void Update()
    {
        ///
        if (amplitude == 0)
        {
            ///
            enabled = false;

            ///
            return;
        }

        ///
        amplitude -= amplitudeRestoreSpeed * Time.deltaTime;
        if (amplitude < 0)
            amplitude = 0;

        ///
        phase += angularSpeed * Time.deltaTime;

        ///
        float y = originalY + Mathf.Cos(phase) * amplitude;

        ///
        var p = camera.transform.position;
        p.y = y;
        camera.transform.position = p;
    }
}