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Michael Burdinov already did a very complete answer.

The short answer for the question "What to do after findHomography?" is: use warpPerspective.

Assuming that you used one of the interest point detectors (FAST, ORB, MSER, FREAK) on both images and then findHomography on the resulting points.

Your next step is to use warpPerspective on one of those images. It will transform the image with the transformation matrix estimated by findHomography.