In the video, how to detect the following body parts and set the object on it?

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C#

ASP.NET

Javascript

webcam

, +

I am already detect the iris (eye) of humans using JavaScript but i want to find out the how to set the jewelleries on human body parts. So i just want to know that how to detect whole body parts using webcam. Give me just idea to detect all parts so i can put object on it. This is the following link that can be very helpfull to understand what i need to know.

https://www.youtube.com/embed/CwS2RbVKbpY?rel=0

What I have tried:

I am just tried to detect iris of human. I just need to know that how to detect all parts of body. I don't understand how to detect all parts so just tell me how it possible. I know it is possible so i just want to how?