From: stuff overlay (istitov/stuff#271)
cudacodec: keep CUDA toolkit headers on the include path when the Nvidia Video
Codec SDK is absent, so the unconditionally-globbed NvEncoder.cpp finds <cuda.h>.

--- a/modules/cudacodec/CMakeLists.txt
+++ b/modules/cudacodec/CMakeLists.txt
@@ -46,6 +46,12 @@
         list(APPEND extra_libs ${CUDA_nvidia-encode_LIBRARY})
       endif()
   endif()
+elseif(ENABLE_CUDA_FIRST_CLASS_LANGUAGE)
+  # cudacodec globs all sources incl. NvEncoder.cpp, which pulls in
+  # private.cuda.hpp -> <cuda.h> even with its body #if'd out when the Nvidia
+  # Video Codec SDK is absent (no NVCUVID/NVCUVENC).  Link cudart so the CUDA
+  # toolkit headers stay on the include path.  istitov/stuff#271, opencv 4.13.0.
+  list(APPEND extra_libs CUDA::cudart${CUDA_LIB_EXT})
 endif()
 
 ocv_create_module(${extra_libs})