Alright this involves a quest within Hillsbrad Foothills "Welcome to the Machine". As a hunter, just grab the quest, hop on, and pop camo. Then get off the horse and there ya have it. This does work with bgs, instances and raids. The visual appearance stays the same but the reduced aggro radius does not work as it does with normal camo. You can however go into stealth from standing still. This works still after logging out, changing continents, etc.
A few restrictions on this however, if you reapply camo again or have a pet attack, this will fade away and you will have to reapply it again.