Combine VR and AR in the same app

Is it possible to make an app that contains both an AR (Vuforia) experience and a VR experience?
They would, in this case, be separated, so the user can choose to do VR or AR from a menu.

As for now, my challenge is that I in unity must choose VR or AR under player settings.

 

Yes, It is Possible to have both AR and VR in the Same Application.

In XR Settings Enable Both Virtual Reality Supported and Vuforia Augmented Reality Supported. Under Virtual Reality Support add two SDK's 1. None & 2. The SDK you want to use (for example say "Cardboard").

Using Both AR Camera & Main Camera in your scene. If your in AR mode enable AR Camera and disable Main Camera, when you want to switch to VR Mode :
1. Disable AR Camera, Pause Vuforia and Enable Main Camera.
2. by using XRSettings.LoadDeviceByName ("Cardborad"); you can enable VR mode.
ref: https://docs.unity3d.com/ScriptReference/XR.XRSettings.LoadDeviceByName.html

When you want to comeback to AR mode again,
1. use XRSettings.LoadDeviceByName ("None"); and disable Main Camera.
2. Enable AR Camera and Resume Vuforia.