Turns out he even have pictures modifying the camera on his blog: http://www.milanracmolnar.hu/blog/2016/7/6/infravrsben-a-vilgthe-world-in-infrared

You can modify them to capture infrared by removing the filter that's inside the camera or use an external filter that blocks all visible light. The sensor is really sensitive to infrared so you can definitely shoot infrared with a digital camera.

These images are captured on a digital camera ( in this case a Nikon D3200) that has been modified to capture the IR light only. The IR blocking filter inside the camera has been removed and replaced with a dedicated IR filter at the wavelength requested by the costumer, different wavelengths produce different results. The types often used by companies are: 590 nm, 665nm, 720 nm [ Hoya R72 and common], 800nm, pure black and white only IR and 900 nm deep black and white only IR, in the old film days the trees would glow and Full Spectrum [ the camera becomes sensitive to picking up UV light, the visible portion and IR light], for this conversion you will need to use external filters on the lens to capture the portion of light you wish to use. Lifepixel offers a Super Blue conversion too [ essentially the 80B Blue filter] and Kolari Vision has a new 550nm filter [ essentially a Hoya Orange Filter] which produces Crimson foliage like old colour IR film.