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How to anchor my 3d object (watch) to a hand?

Hi I want to track the position and orientation of my hand and render a watch around it. I don't want to use any physical markers or images on hand. As far as I understand, we can't have a hand as a predefined target. I tried User Defined Targets, but I am not able to fix the position of watch correctly and it is not stable.

I am using Unity 2018.2

There are two problems: 1. How to track the hand and effectively track the base position to anchor the watch to. 2. How to anchor the watch to a custom object (hand) by giving the position of the object.

Please guide how to do this.

Thanks