How to adjust the background camera of ARCore in combination with GearVR?

Question

I'm using a Samsung Galaxy S8, Unity3D, Gear VR and ARCore. ARCore is used as a passthrough of the smartphone camera. Unfortunately the resolution of the background is stretched. (As you can see in the image, which should display a circle)

Does anyone know how to change the background resolution?

Answer 1

After a long time fiddling around I found an acceptable solution for me.

public class SetResolution : MonoBehaviour {
    public int width = 1480; //half of the Samsung S8 WQHD+ 2960x1440 resolution 
    public int height = 1440;

    void Start () {
        Screen.SetResolution(width, height, true); 
    }

    void Update () {
    }
}

Maybe there is a more elegant solution but it works for me.