The same photographer posted a very slow motion version of the same video: https://youtu.be/0tQ80Sj3QUs?t=122

Also note that you can hit "." on a paused video on youtube to go frame-by-frame.

Some observations:

* The camera vibrates long before the pressure wave reaches it. I assume this is due to energy traveling through the ground (i.e. an earthquake).

* On the third building from the bottom left there is some light reflected from another building's windows. Once the camera stops moving, these seem to still be moving.

* As the camera falls, two frames show a Nikon camera strap and a separate camera. It appears as if the photographer is taking stills. I haven't been able to find that these photographs were published, perhaps none were taken of the blast.