EXCLUSIVE

The guy behind celeb emoji apps for Amber Rose, Steph Curry, Rick Ross and Future just got arrested for stealing, and thanks to a YouTube star ... the whole bust was recorded.

Cops say they got a call for a stolen camera at LAX Monday. When they arrived, they were told Oliver Camilo had yanked the equipment from a passenger on his plane. Unfortunately for Camilo that passenger was a friend of YouTuber DOSEofFOUSEY.

You can see in DoF's video ... Camilo initially denied jacking the gear, but after a ton of prodding ... gave it up and ended up in handcuffs.

DoF chose to blur Camilo's face but our law enforcement sources tell us it's the celeb app creator.

Plus, Camilo himself told us he planned to turn in the camera to lost and found. He says he was shocked by how aggressive DoF was, and that's why he didn't want to hand it over right away. He actually thinks the whole thing was some weird YouTube video experiment.