Unity's Gizmos functionality doesn't work in VR, so VrGizmos offers a similar immediate-mode way to draw debug visualisation.
It is not intended to fully mimic the Gizmos API or reproduce all of its functionality. At the moment functionality is also fairly limited.
Sigtrap.VrGizmos.alpha = 0.2f;
Sigtrap.VrGizmos.DrawSphere(transform.position, 1f, Color.green);