You obtain different perks through stashing collections. Considering there aren't as many perks as collections, I assume it is a random gift.
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Some of the Perks can be found under the related links although you do have to scroll down to the section
4
When you die in Zombies, you do not keep your perks.
In Call of Duty: Black Ops 2 Zombies, there isn't a strict limit on the number of times you can purchase perks, but there are specific mechanics that affect their availability. Players can buy perks multiple times, but after the first purchase, the cost increases, and once the player has reached the perk limit (four perks total), they cannot buy additional perks until they down or lose them. Additionally, some maps have specific perks that can only be acquired in designated areas or under certain conditions.
PHD Flopper and Stamin-up
it depend sif your playing black ops zombies or world at war zombies black op zombies has stamin up double tap and PhD flopper regular world at war zombies has speed cola jugger nog and quick revive
Good Perks, good weapon combinations, good tactics, and a place to run to if you get swarmed.
I got better at zombies by playing often and watching YouTube videos, but I would recommend buying perks, learning how to "train" zombies, using Pack-A-Punch/traps/mystery box to your advantage.
Quick revive, juggernog or juggernaut, Speed Cola, and Double tap.
its not by lil scrappy. its called gangsta by young blaze. and its super sick :)
The Perks-a-cola machine Juggernog is the most important perk of them all. It takes you maximum zombie hits from 2 to 6 hits.