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there is setRNGSeed()

and it's counterpart in python:

>>> help(cv2.setRNGSeed)
Help on built-in function setRNGSeed:

setRNGSeed(...)
    setRNGSeed(seed) -> None
    .   @brief Sets state of default random number generator.
    .
    .   The function cv::setRNGSeed sets state of default random number generator to custom value.
    .   @param seed new state for default random number generator
    .   @sa RNG, randu, randn