As it turns out the guy in the Rocket Jump video makes tons of videos, just like that one.
Below is my favorite.
And heres how he made it.
Be sure to check out his youtube channel, he has tons of other videos, with behind the scenes clips, tips and info on using after effects and the other methods that he uses to make his videos.
I actually found his channel from the steam recent news space on Counter Strike 1.6, from which this video was featured - pretty relevant I think!