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There is an example under <your-opencv-folder>/opencv/samples/python2/gaussian_mix.py , it shows that you can access the mean and cov-matrices via getMat('means') and getMatVector('covs'), e.g.:
em = cv2.EM(...) // specify params inside
em.train(...) // train your em
// get mean and covariance matrices
means = em.getMat('means')
covs = em.getMatVector('covs')