thank you very much. finally， its work. Is this necessary in python for it to work? Or is it caused by a problem with my system environment? See [this](https://github.com/cudawarped/opencv-experiments/blob/master/nbs/ImportError_dll_load_failed_while_importing_cv2.ipynb) guide，and sitll dont know why the system path no working for gstreamer,but working for cuda 
, but fin , I can now test with gstreamer
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