Seriously, who needs to record someone without the knowledge of the person being recorded? That’s a big red flag, a perverted character, there’s no other explanation. Creepy Mark Zuckerberg allowed other creepy characters to share personal moments with him.
I guess that makes sense, but that seems way more expensive than just mounting a gopro to a hard hat
Doing an Internet search, they are about the same price.
Or you could just use a cheap camera (might be less expensive than the hard hat) or your work phone. (Free) They also have the benefit of not being fixed to your head and a viewfinder so you know exactly what’s in frame.