Someone know if is it possible to detect security cameras with a infrared sensor?
Yes, it is possible to detect a security camera that is in operation by using infrared.
oh nice, but probably the sensor can detect false positive right?
Right.
Of course you could use an infrared camera and machine learning to possibly differentiate between heat sources using something like OpenCV or TensorFlow.
mhhh interesting 
A BeagleBone AI-64, a BeagleBone Play or a RaspberryPi could to the trick. The BeagleBones have onboard ML hardware for faster image processing over the Pi.
however I think it is not strictly necessary to use such complex systems, I could probably go and study the type of infrared generated by the cameras and calibrate the algorithm so that it can reduce false positives... so I would just use an arduino and a couple of sensors...
might be an idea, I need to think more about it
There are different frequencies of IR. I don't know what frequency is used by the sensor you're thinking of but a camera without an IR filter (or one that isn't very good) can see it and will give you a false color rendering. A cheap cell phone camera can be good for this. Theoretically you could set up a bandpass filter and look for a particular blob or pixel saturation with machine vision.
To detect IR illumination, you need a detector that operates on the same wavelengths.
If it's only a sensor or IR camera that senses or captures and image of heat, you cannot "detect" it because it's not putting-out a signal.
There are some IR cameras with IR "illumination" and I think some night vision works that way too.
A PIR (passive infra-read motion detector) like in my burglar isn't putting-out anything that can be detected. It's a receiver, not a transmitter... (Except it does have red LED that lights-up when it detects motion).
Agreed. Most in my experience have the IR ring light because the true night vision cameras are more expensive. Sometimes the LED's in these bleed over into the visible red light spectrum and you can see them dimly with your eyes but usually you need a cheap camera.
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