Your video does not appear to show any indication of cheating. You were blatantly firing rockets in their direction which is a clear giveaway as to your location. Additionally, you were spotted when you stood up to throw a grenade. It's not impossible for them to drive around and see where you were laying prone. In the future, the best type of recording is one taken from spectator view so we can see how and where they are aiming.
Your video evidence provided is insufficient in this case thus no action will be taken against this player.