From: Paul Zander <negril.nx+gentoo@gmail.com>

Use tar.gz instead of zip to make CI happy.

diff --git a/modules/cudaoptflow/CMakeLists.txt b/modules/cudaoptflow/CMakeLists.txt
index b295abc..1e916e5 100644
--- a/modules/cudaoptflow/CMakeLists.txt
+++ b/modules/cudaoptflow/CMakeLists.txt
@@ -10,9 +10,9 @@ ocv_define_module(cudaoptflow opencv_video opencv_optflow opencv_cudaarithm open
 
 if(NOT CUDA_VERSION VERSION_LESS "10.0")
   set(NVIDIA_OPTICAL_FLOW_2_0_HEADERS_COMMIT "edb50da3cf849840d680249aa6dbef248ebce2ca")
-  set(NVIDIA_OPTICAL_FLOW_2_0_HEADERS_MD5 "a73cd48b18dcc0cc8933b30796074191")
+  set(NVIDIA_OPTICAL_FLOW_2_0_HEADERS_MD5 "5626b1d1c335fbcbf893fcb27e1230be")
   set(NVIDIA_OPTICAL_FLOW_2_0_HEADERS_PATH "${OpenCV_BINARY_DIR}/3rdparty/NVIDIAOpticalFlowSDK_2_0_Headers")
-  ocv_download(FILENAME "${NVIDIA_OPTICAL_FLOW_2_0_HEADERS_COMMIT}.zip"
+  ocv_download(FILENAME "${NVIDIA_OPTICAL_FLOW_2_0_HEADERS_COMMIT}.tar.gz"
                  HASH ${NVIDIA_OPTICAL_FLOW_2_0_HEADERS_MD5}
                  URL "https://github.com/NVIDIA/NVIDIAOpticalFlowSDK/archive/"
                  DESTINATION_DIR "${NVIDIA_OPTICAL_FLOW_2_0_HEADERS_PATH}"