Reference footage for people

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Hello everyone, I am building a passenger tracking system and have gotten pretty far :-) my system can detect already lots of different things id say mostly 75% accuracy but what i wanted to ask was if someone knew of any place i can gather reference footage from top down perspective, face , heads ..etc i can find lots of, but not top down.

I would like to avoid playing the creeper and shooting footage in subways or crowded areas to get a lot of footage.

Or alternatively if someone has a haar cascade library with lots of references :-).

Best Regards, Bob