Pinch zoom image

Ionic Framework ionic-v3
1

any good example for pinch zoom image ?
I tried below code and its not working.

<ion-content padding class="image">
    <ion-scroll zoom="true" maxZoom="20"  scrollX="true" scrollY="true" >
      <img src="image.jpg" >
    </ion-scroll>
</ion-content>
2

Any tips on this? I am able to looking on the same help