video signals are calibrated with a wave form monitor (luma levels) and a vectorscope (color). we often do this on set, and virtually always in post.
the histogram is closely akin to a waveform monitor. since luma levels effect color value, checking your histogram will, in addition to giving you good info re the black and the highlights, also help produce more accurate color values. (assuming you're white balanced correctly.)
every time you re-set your white balance you are, essentially, re-calibrating your camera for color values.
but are you talking about other camera calibrations? these, btw, are most usually performed by a tech using test equipment.