The weapon shown is the video is SA-7 or similar
The Urdu text when the video starts says that they fired the missile from 3 k-meters and it hit the chopper in the tail rotor.
If they had made such an elaborate plan as they claim and even observed that the shot they fired hitting the tail rotor then why not show the video of the hit ? they make propaganda videos of just about any thing they do
Questions:
1. Did any observer see a smoke trail , TTP claims the fired from 3 KM away , 3 KM is significant distance for missile to travel it will leave a smoke trail that will be visible 15 to 20 minutes or more after missile has traveled.
2. Heat seeker don't usually seek the spinning blade , they seek the engine exhaust , so while its possible that the tail rotor can get hit but more likely the hit will happen near or close to the main rotor.