As blackbody radiation emissivity equation predicts everything having temperature above absolute zero emits radiation in relation of temperature that it has. So since human body posses permanent temperature 37 degree in Celsium
and emits at peak in infrared ( 10 um ) band so what is the intensity of emitting light from human body ?

The power of light emitted from black body radiation can be calculated using the Stefan-Boltzman equation:

p = \sigma A T^4

where \sigma = 5.67 \times 10 ^{-8} \frac W {m^2 K^4}, A is surface area and T is temp in Kelvins. If you want intensity of light, divide that by 4 \pi A to get intensity in units of watt per steradian per square meter.