Explanation:
The camera which I use in this video is modified to see full spectrum of light, from infrared down to ultraviolet. If I hold now an IR & UV cut-off filter in front of the lens, only visible light reaches the sensor. Therefore the image turns on that place into normal color.
Normally every camera with a CMOS sensor would see the world reddish (or in other strange colors), because the sensor is sensitive to a much broader spectrum than the human eye is.
Of course no one want's an image like this, therefor manufactures place an IR & UV cut-off filter into the camera which limits the incoming light spectrum to visible colors only.

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