The video in this post was allegedly filmed on Aug. 20, 2014, somewhere near Lugansk where a Ukrainian Mi-24 Hind gunship helicopter was hit and shot down by an anti-aircraft missile while on patrol with another helicopter of the same type.
Both crew members, reportedly Major Oleg Biryukov and Captain Anton Rodionov, died in the crash.
It looks like the Hind was flying at low altitude, when it was hit by a missile: in a matter of seconds the helicopter hit the ground and (probably exploded) with the camera the crew members brought with them in the cockpit among the only surviving things.
The photograph above shows the wreckage of the chopper.
source: The Aviationist