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okay so I found the answer myself, maybe it will help someone who got a similar problem:

I downloaded the leg_detector package as part of the whole people-package and split them afterwards because i thought i only need the leg_detector. big mistake by me, I shouldn't have switched up the directories. after I copypasted just the whole dir into my catkin_ws and executed catkin_make, i needed to again source my workspace in every shell (the permanent solution somehow doesnt work right now) before i can use the people-messages.

the syntax in my code for getting position seems to be alright, I know get my data and can work with it :)