Check out this video from "Chickentikka" (he is also a lad who writes articles for RSR). He was in China for a couple weeks and assisted to the 2015 Beijing Military Parade 70th Anniversary Air Display.
He said: " I made a mistake its not the H-9 its the Z-9 attack helicopter, I was too excited at the time."
I also told him for next time record with the phone horizontally but still...got goosebumps from seeing all those "flying tanks". :P
Oh, he also asked to share his other video of China's DF-21D ballistic missile: