Passing elements into Matrix

Hey Guys,
I'm trying to implement a function in openCV which is find homography between 2 frames and the inputs to this function are matrices but I have a set of points(Values) and I wanna put these values in a matrix in order to use it in the function mentioned above, can you tell me what should I do?
Hence: it's great to give me some options in openCV as well.

Thank you.
So what was your point?
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