No it doesn’t exist, if you are reading from device 0 your only option is to use cv2.VideoCapture().
My advice would be to find the function in C++ and then use the tab autocomplete or help() in python to get the order of the input arguments as they can be different to the C++ ones. Then you can use any C++ tutorials.
Additionally you can find examples of how to call the python CUDA functions by examining the tests for each CUDA module (opencv_contrib/modules/cudaxxx/misc/python/test/test_xxx.py) e.g. cudafilters.
Finally I wrote a toy example to verify that I could get the same perfomance in python as in C++ using CUDA streams which you may find useful