Virtual Button Image

Input:

Create Cube on Cube

Create Sphere on Sphere

On Image Target go to Inspector -> Advance Option and Add Virtual Button

Name the Button , Select Sensitivity 

Programming Virtual Button 

Create C# Script

using UnityEngine;

using Vuforia;

Insert Below Code inside Class 

public GameObject cubeGO, sphereGO;

VirtualButtonBehaviour vrb;

// Start is called before the first frame update

void Start()

{

    cubeGO.SetActive(false);

    sphereGO.SetActive(true);

    vrb = GetComponentInChildren<VirtualButtonBehaviour>();

    vrb.RegisterOnButtonPressed(onButtonPressed);

    vrb.RegisterOnButtonReleased(onButtonReleased);

}

public void onButtonPressed(VirtualButtonBehaviour vb)

{

    cubeGO.SetActive(true);

    sphereGO.SetActive(false);

    Debug.Log("Button Pressed");

}

public void onButtonReleased(VirtualButtonBehaviour vb)

{

    cubeGO.SetActive(false);

    sphereGO.SetActive(true);

    Debug.Log("Button Released");

}