There is nothing different between infrared and visible light in terms of candid photography techniques or composition.
It is very popular to use infrared photography for landscape or cityscape. Infrared light dramatically changes tonality of grass, tree leaves and sky giving picture sometimes surreal quality.

In candid photography infrared was popularized by Weegee. He used infrared flash to take pictures in the total darkness. I don’t use a flash, even invisible one.
As a candid photographer I like infrared for unusual tonality of the skin and cloth. Infrared gives contrast to the image that is impossible to achieve using visible light.

When sun is in zenith of the clear sky, it is absolutely the worst time for taking visible light pictures and it is usually the best for infrared shooting.

All pictures are taken by converted to infrared Pentax *istDS with Pentax-DA 1:3.5-5.6 18-55mm AL

Fez tannery is the only place in Morocco where I chose telephoto 70mm instead of the wide angle 21mm. We were escorted to the elevated balcony. Taking pictures from the top is not ideal for candids but using camera’s viewfinder and having freedom to wait for interesting moment was very refreshing after close range of the Fez alleys.
Related topics
Candid street photography in Morocco with Pentax K-5 and 21mm f/3.2
Pentax 70 mm f/2.4 DA Limited for Candid Street Photography
In the previous post I described some technical challenges for candid photography in Morocco.
I had my own share of missed opportunities due to technical misjudgment or just sloppiness.
Sometimes, I found interesting artistic expression in obviously ruined shots.

When I was taking pictures of doors I used low shutter speed. I forgot my camera was still on this setting.

Overexposed, blown-out highlights occurred from not adjusting exposure after walking in a deeply shaded narrow street.

I failed to change focus when this man moved towards me.
Related topics
Why is the candid photography unique?
Candid street photography in Morocco with Pentax K-5 and 21mm f/3.2