What is Photogrammetry? 

Hi, you say right that in photogrammetry you should not use reflective materials and in general elements that move, because this obviously deceives the solving of the scene. And in fact the glass object is perhaps not the best example. But if you notice, though, in the video we deliberately used as examples of markers the edges of the table and not markers present on the glass vase, precisely for the reason you say. The example is meant to show how, even in the presence of unsuitable objects, tracking should be done on stable markers that do not move. Perhaps this should have been made clearer.