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I can compile on windows without any problems as Visual Studio doesn't have an issue with creating a temporary object and then passing by reference, however I suspect you need to chane

Ptr<cuda::NvidiaOpticalFlow_1_0> nvof = cuda::NvidiaOpticalFlow_1_0::create(frame0.size().width, frame0.size().height,
    NvidiaOpticalFlow_1_0::NVIDIA_OF_PERF_LEVEL::NV_OF_PERF_LEVEL_FAST, false, false, false, 0, Stream(), Stream());

to

Ptr<cuda::NvidiaOpticalFlow_1_0> nvof = cuda::NvidiaOpticalFlow_1_0::create(frame0.size().width, frame0.size().height,
    NvidiaOpticalFlow_1_0::NVIDIA_OF_PERF_LEVEL::NV_OF_PERF_LEVEL_FAST, false, false, false, 0, Stream::Null(), Stream::Null());

to get it to compile with gcc.