I have it for PC, and it's NOTHING like that... on PC, Call of Duty uses a service called Punkbuster which basically bans any cheats.
And about 99% of servers have punkbuster on.
In WaW I saw one cheater the day the game came out, after that PB (punkbuster) updated and I haven't seen any since.
I'm guessing the guy in the video started his own private server so he could fly around and things. It's actually quite usefull if you want to check how high invisible walls are etc.
But there are NO hackers/cheaters in CoD on PC. Well there are some, but only on the 1% of servers that dont have punkbuster. I've had CoD4 since it came out, and I didnt see 1 single cheater either.
Yeah i know, my friend has it for PC and it isnt like that. I was just joking, but he didnt need to set up his own private server. You can hack the game offline because there is no punkbuster there. So he could of done it on Solo offline with the hack.