using this component to zoom in and out in aframe sky element in oculus-touch-controls .

AFRAME.registerComponent('c-oculus-zoom-in-out', { init: function() {

    this.el.addEventListener('thumbstickmoved', this.logThumbstick);
},
logThumbstick: function(evt) {

    if (evt.detail.y < -0.95) { 
      
        console.log("UP"); 
    }
    if (evt.detail.y > 0.95) { 
       
        console.log("DOWN"); 
    }
   
}

});