DIY peephole camera

Hi Everyone! Been reading a lot about wyze. I hope you can help me with this. I need to build a peephole camera. I live in an apt and they wont allow me to remove peephole or add a dorbell cam. So I need to build a camera at the inside of the door and nothing on the outside. I have a circle one. I read a few posts here but it was about opening the camera. I don’t want to open it. Anyway to attach a lense on the outside? I saw people adding lenses. Which lens will work or how do I choose a lense?

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