Maybe some bored software developer could create the "uBlock of employee trackers". A program that would feed fake data into these trackers to make them unreliable for employers.
An open video stream to employees workstation could be reasonable if there is suspicion of fraud, like outsourcing their work to untrusted 3rd parties. It's not too unlike having an employee in the office. Though even in office employees have some expectations of privacy, like not exposing their home life or bathroom routines. Of course a company device would still need to be provided.