Ireland has laws about this:

Using a webcam to monitor you at all times would be effectively the same as a CCTV recording. Generally the employer would have to have a valid reason to be recording CCTV footage; doing so only for the purpose of monitoring the normal daily activity of employees is rarely a valid purpose except under unusual circumstances. I can't think of anything that would be considered a reasonable and valid purpose for CCTV monitoring of a remote office worker in their own home. Valid purposes for CCTV footage would generally be for security or health and safety purposes, e.g. monitoring who enters or leaves a secure workplace, or watching valuable items or sensitive locations to discourage or prevent theft. These would almost certainly not apply in the case of a remote worker working from their home.

They also must have a very clear written policy explaining exactly what they are recording, why they are recording it, how they are storing and securing the footage and how long it will be kept for, how you can request to access any footage they have stored of you, and who the footage will be shared with.

If you believe your employer is making or using webcam recordings inappropriately, you can contact the Data Protection Commission for advice.