Nuitrack + Orbbec Astra Pro Body Measurement

Hello,
I am trying to measure the parts of body lengths like arm, leg, waist etc. with length and area (For example I want to get the biceps width or waist width). Until now, I have been able to create and track the skeleton and draw it, get the joints and find the necessary length between joints approximately. But I am stuck how to find the width. In my thinking, I have to whether rotate the camera or myself around to calculate the width. But I still don’t know whether this is right or it will work. Can someone redirect me in the right direction? And I have to get pretty close to the real measures. So not so much %error.

Body volume measurement is a non-standard case, so we’ll be glad to receive any feedback from you on this topic.