Unless someone recognizes the brand and has a power supply they can use as a reference you're really in the dark. You don't know-

The voltage (too much will fry it, too little and it won't work)

The amperage (too little and it won't work, too much is no problem)

The polarity (which is positive, which is negative, get it wrong and you'll fry it)

And there's even a small possibility that it requires AC, rather than DC power (cheaper power supply, more complicated circuit board).

Try going to Google Shopping and searching for security cameras. See if you can find the same thing. You might even find a replacement power supply.

The only thing that's a bit confusing is that it has a red, green, blue sticker on it, which indicates that it's color, but the LEDs on the side are generally IR, which is more common for black and white.