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You can found all default parameters here: https://github.com/Itseez/opencv/blob/2.4/modules/video/src/tvl1flow.cpp#L142

tau            = 0.25;
lambda         = 0.15;
theta          = 0.3;
nscales        = 5;
warps          = 5;
epsilon        = 0.01;
iterations     = 300;
useInitialFlow = false;