Nope. If an Officer has something like his identity to "hide". I'm of the mindset that there is good reason.
Here in the US, vice cops, DEA, undercover cops are, I would say, 99% of the time plain clothes and undercover. They aren't the cops on the beat or in the marked cruisers giving tickets, being the uniformed presence at a scene, etc. When you look at most of the "Cops Caught on Tape" they are uniformed police. The OP video is unique to a point as it is an unmarked, plain clothes statie. But he is most likely out there doing traffic duty catching knuckleheads like the guy on the bike. Pulling the gun? You have to wonder why as I think a badge would have been enough as well as his lights in the vehicle.