How to hook up a camera to iphone?

So I want to get a camera that records my aquarium and uploads it's live feed to my iphone so I can see what's happening when I'm away/on vacation. Just a simple video camera, no motion detector/screenshotter. How can I do this, what do I need to buy and do, and how much would it cost? All help is appreciated.

You'll need a computer/Tablet/Device with CPU and a lot of coding. Unless there's someone like who already had done all that and willing to sell/share his software.