In ionic naitve google map, How to keep marker in center when i drag map or on camera_move_start, Like uber do or Careem

Ionic Native
2 
<div id="map_canvas">
   <img src="assets/marker.png" id="centerMarkerImg">
</div>

#map_canvas {
  position: relative;
}
#centerMarkerImage {
  position: absolute;
  left: 0;
  top: 0;
  right: 0;
  bottom:0;
  margin: auto;
  width: 32px; // image width
  height: 24px; // image height
  z-index: 1;
}


export class HomePage {
  dummyMarker: any;
  mapDragMode: boolean = false;
  centerPos: any;

  ionViewDidLoad() {
    this.dummyMarker = document.getElementById("centerMarkerImg");
    this.dummyMarker.style.display = 'none';
  }

  loadMap() {
     this.map.on(GoogleMapsEvent.CAMERA_CHANGE).subscribe((params: any[]) => {
       if (!this.mapDragMode) {
         return;
       }
       const cameraPosition: any = params[0];
       this.centerPos = cameraPosition.target;
     });
   }
  start() : {
    this.mapDragMode = true;
    this.dummyMarker.style.display = 'block';
  }

  end() : {
    this.mapDragMode = false;
    this.dummyMarker.style.display = 'none';
  }

}