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If the person to be measured has for example in hand or on the t-shirt a marker of known size it is possible to obtain approximately the height. An other option if you don't move the camera could be to put same marker on the floor at a known distance and say to the people to go with their shoes on those marker. Remember that if you don't know the distance between the camera and the object to be measured there's is an ambiguity problem, passing from 3d world to 2d coordinates you lose distances.