Security camera records a man disappearing through a window

Is this real or fake?

This video footage has been shared on Facebook and is said to be from a security camera from a residential building.

It shows a man leaving an apartment and heading along a corridor towards a window.

The man then disappears as he approaches the window. There are apparently no doors there. A shadow can be seen too just after the disappearance as if the man is in shadow form.

What do you think?