Meaningless. The right is meaningless in practice. You will be threatened with arrest and likely arrested for resisting arrest if you actually are in danger of videoing anything that's important. The actual act will likely be obscured by policemen who will stand in between, block the view, or shine their flashlights into your camera.

If I see the cops doing something obviously insane, I will turn and walk away. I didn't see anything. When you engage with power, you know not to threaten it.