Hmm, i don't think it's legal to set up cctv on other people's premise, so yeah you will need to ask for permission.

Maybe you might wanna consider changing the nursing home?

You cant add your cctv there, as you are paying for their service, not the space itself. Just change to another if you suspect foul play.

Disclaimer: I am not a lawyer; I am not your lawyer

But I searched for recordings in private and public (and similar terms) and I got the following links: https://www.azmilaw.com/insights/covertly-obtained-telephone-conversation-is-it-admissible-in-court/ https://dnh.com.my/secret-recordings-are-they-admissible/

https://asklegal.my/p/cctv-camera-recording-surveillance-malaysia-property-privacy-pdpa

https://www.nst.com.my/news/2015/09/public-officials-and-private-space

https://dnh.com.my/secret-recordings-are-they-admissible/

the TLDR that I conclude is:

• it's a private property so the home's management will be fully within their rights to deny your request, should you ask

• you can however, for your parents, find some other way of recording - e.g. using the phone or some other device. you will definitely be at risk should you get caught. the risk is either you've done something without permission; or you've alerted the abuser (if there is one). be careful - any of that may cause a worsened treatment for your parents

• if you do successfully record anything that can be used to bring up to management, it seems that as there's no real privacy laws per se, they can't hit you on this. They may use some other clause in the contract signed. Will there be a strong case? idk. most of them intimidation into dropping the complaint is enough.

• ok, let's say you've managed to win the initial faceoff with managment, then great. hopefully the abuser is fired and/or you get compensation and/or you feel better about your gut feeling and find a better nursing home. if they want to take legal action though, i would suggest you act first - because they've breached a duty of care to your parents. will the recordings be admissible as actual evidence? the links show that it's not a given BUT because we don't have a jury system it's fine because if you can make the proper argument, the judge will still view/listen to the recordings and consider them in their judgment. Though I mean at this point, you better have a lawyer that's great at contract law.