The company's behavior does not violate the law, because the company is a workplace, not a personal living place. If the company records or videos in the toilet or other places belonging to personal life, this behavior is an infringement of employees' privacy, and you can call the police or file a civil tort lawsuit. At the same time, the evidence obtained by the company through this behavior cannot be used as evidence because it is not legal.
When the domestic branch of a foreign company asks questions about employees' audio and video recordings, as long as employees don't object, then the company's behavior is legal, and the evidence obtained by the company based on this can be accepted by the court.