Jay Rock has been arrested for felony gun possession ... and, the whole interaction with cops was apparently caught on video.

Grammy Award-winning rapper Jay Rock was arrested Thursday evening near the Watts public housing complex where he grew up and booked on suspicion of illegal firearm possession ... which prohibits ...

Video According to TMZ, Jay Rock was accused of trespassing, and when officers attempted to detain him, things escalated quickly; resulting in his arrest for felony gun possession. LAPD sources ...