Merge branch 'master' into gpu-cuda-rename

Conflicts:
	modules/core/include/opencv2/core/cuda.hpp
	modules/cudacodec/src/thread.cpp
	modules/cudacodec/src/thread.hpp
	modules/superres/perf/perf_superres.cpp
	modules/superres/src/btv_l1_cuda.cpp
	modules/superres/src/optical_flow.cpp
	modules/videostab/src/global_motion.cpp
	modules/videostab/src/inpainting.cpp
	samples/cpp/stitching_detailed.cpp
	samples/cpp/videostab.cpp
	samples/gpu/stereo_multi.cpp

modules/stitching/src/blenders.cpp

@@ -50,13 +50,13 @@ static const float WEIGHT_EPS = 1e-5f;
 Ptr<Blender> Blender::createDefault(int type, bool try_gpu)
 {
     if (type == NO)
-        return new Blender();
+        return makePtr<Blender>();
     if (type == FEATHER)
-        return new FeatherBlender();
+        return makePtr<FeatherBlender>();
     if (type == MULTI_BAND)
-        return new MultiBandBlender(try_gpu);
+        return makePtr<MultiBandBlender>(try_gpu);
     CV_Error(Error::StsBadArg, "unsupported blending method");
-    return NULL;
+    return Ptr<Blender>();
 }