WOW! I finally did it! I MADE THIS TUTORIAL after like a year of people asking me to do it. Ok... it was 9 months ago-ish to be more exact but you get the idea.
The robot arm (provided below) was originally part of a free base mesh called "lowman_shoes" I got off a 3D site (I cant remember which one)!
I modeled it into a robot arm which I then decided to attach to some keyed footage (also provided below) I filmed on my green screen.
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Free assets for tutorial...
Keyed Footage:
https://drive.google.com/file/d/15OJslmAXO-kBExHyCU4WCiAtEoHeaR4j/view?usp=sharing
Robot Arm Model FBX: https://drive.google.com/file/d/1Jj8y1ZiRZehusQMwdV7rQn_BAQqQ78lG/view?usp=sharing
S U B S C R I B E or the trackers will not work right!!!