There are a number of wireless camera systems that account for this type of requirement. Some build cameras that are strictly for night vision use, and are high resolution black and white cameras, and some are color during the day and then switch to night mode and black and white recording.
Infrared cameras can capture the image in one of two ways, relfected light and thermal energy. They are able to do this because their light or energy gathering elements are much more senstative to it than the human eye. The infrared camera simply takes what it can see and converts it into something that is visible the eye using amplification. Since thermal imaging is much too expensive, it leaves the majority of infrared cameras as enhanced relfected light imaging.
Some infrared wirless cameras come in dual mode, where the camera switches between normal imaging and night imaging based on the level of ambient light in the environment in which the camera is mounted.
