The real insight here isn't that these vibrations exist - but that they can be extracted from simple video. Also, laser microphones (the devices you are referring to) depend on a laser beam that must reflect coherently off the object into a precisely positioned sensor. This pretty much limits the use of laser mics to windows. Here is the video posted by the authors of the paper: https://www.youtube.com/watch?...

I think maybe you meant to link to this video: https://www.youtube.com/watch?...