A lot of dashcams can do this, but doubt most places will bother to even check the thing unless there’s an accident or report of one.
Unless anyone is getting sacked for singing, I wouldn’t worry too much as its likely just the office trying vauge threats to keep people compliant. They really dont want to have to train someone else.
Will you find it in class 2 or 1 - unlikely unless maybe working for a supermarket. If so they’ll just hear **** **** **** most of the way down the M1 as you hit all the potholes and uneven bumps in the motorway along with a spattering if “[fb] Audi driver!!”. 