From: https://gitlab.archlinux.org/archlinux/packaging/packages/opencv/-/blob/main/fix-nppi-bufsize-type.patch?ref_type=heads
--- a/modules/cudaarithm/src/reductions.cpp	2023-12-26 22:24:58.000000000 +0100
+++ b/modules/cudaarithm/src/reductions.cpp	2024-03-18 16:51:32.108049155 +0100
@@ -151,7 +151,7 @@
     sz.width  = gsrc.cols;
     sz.height = gsrc.rows;

-    int bufSize;
+    size_t bufSize;
 #if (CUDA_VERSION <= 4020)
     nppSafeCall( nppiMeanStdDev8uC1RGetBufferHostSize(sz, &bufSize) );
 #else
@@ -227,7 +227,7 @@
     sz.width  = gsrc.cols;
     sz.height = gsrc.rows;

-    int bufSize;
+    size_t bufSize;
 #if (CUDA_VERSION <= 4020)
         nppSafeCall( nppiMeanStdDev8uC1MRGetBufferHostSize(sz, &bufSize) );
 #else
--- a/modules/cudaimgproc/src/histogram.cpp	2023-12-26 22:24:58.000000000 +0100
+++ b/modules/cudaimgproc/src/histogram.cpp	2024-03-18 17:51:37.005208948 +0100
@@ -281,8 +281,8 @@

 namespace
 {
-    typedef NppStatus (*get_buf_size_c1_t)(NppiSize oSizeROI, int nLevels, int* hpBufferSize);
-    typedef NppStatus (*get_buf_size_c4_t)(NppiSize oSizeROI, int nLevels[], int* hpBufferSize);
+    typedef NppStatus (*get_buf_size_c1_t)(NppiSize oSizeROI, int nLevels, size_t* hpBufferSize);
+    typedef NppStatus (*get_buf_size_c4_t)(NppiSize oSizeROI, int nLevels[], size_t* hpBufferSize);

     template<int SDEPTH> struct NppHistogramEvenFuncC1
     {
@@ -315,7 +315,7 @@
             sz.width = src.cols;
             sz.height = src.rows;

-            int buf_size;
+            size_t buf_size;
             get_buf_size(sz, levels, &buf_size);

             BufferPool pool(stream);
@@ -349,7 +349,7 @@

             Npp32s* pHist[] = {hist[0].ptr<Npp32s>(), hist[1].ptr<Npp32s>(), hist[2].ptr<Npp32s>(), hist[3].ptr<Npp32s>()};

-            int buf_size;
+            size_t buf_size;
             get_buf_size(sz, levels, &buf_size);

             BufferPool pool(stream);
@@ -419,7 +419,7 @@
             sz.width = src.cols;
             sz.height = src.rows;

-            int buf_size;
+            size_t buf_size;
             get_buf_size(sz, levels.cols, &buf_size);

             BufferPool pool(stream);
@@ -460,7 +460,7 @@
             sz.width = src.cols;
             sz.height = src.rows;

-            int buf_size;
+            size_t buf_size;
             get_buf_size(sz, nLevels, &buf_size);

             BufferPool pool(stream);