Look at the video again, notice: after 1 min and 10 secs, theres a timer on in the window....NOTICE that the time is going very fast, so in this case....how to make a speedhack: record a game then edit the video to play 4 times as fast or whatever you prefer!
That sort of speedhack is impossible to make...
what you might be able to do is for example remove the reload time (or make it veryfast)...