Region of Interest opencv python

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Okay, On further analysis realized that the cv2 since it has been supporting numpy array structure, there is no longer any need for a API, the entire image can be manipulated in the array itself.
eg:

img = cv2.imread('image.png')
img = img[c1:c1+25,r1:r1+25]

Here c1 is the left side column pixel location, and r1 is the corresponding row location. And img now has the image specified within the pixels as the ROI.

EDIT:
Very nicely explained here, How to copy a image region using opencv in python?

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