I suggest checking out this forum thread
that already discusses this issue and provides links to possible approaches to this task. Most of them require a significant effort as jQuery does not provide pinch and zoom out of the box.
If you are willing to try another approach, you can use Kendo UI Mobile to add pinch and zoom to your app. You can check out our Pinch and Zoom sample app
Also, in the future, please, avoid posting the same inquiry in multiple forums as this might significantly slow our response time. We have closed the duplicate thread. Thank you!
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