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How to find the convex hull using opencv

Hello, I know that I can access pixels using "<char>(i,j)" where i, j are columns and rows of an image. Now I have a set of pixels i.e. a set of (i,j) values of an image. I would like to extract the convex hull of the image using those (i, j) values. Could any one give me some tips how that can be done using opencv?

Thanks in advance.