Enabled VAS OT in G-API Python interface

modules/python/src2/cv2_convert.hpp

@@ -156,6 +156,33 @@ struct PyOpenCV_Converter
     }
 };
 
+// There is conflict between "uint64_t" and "size_t".
+// They are the same type on some 32-bit platforms.
+template<typename T>
+struct PyOpenCV_Converter
+    < T, typename std::enable_if< std::is_same<uint64_t, T>::value && !std::is_same<uint64_t, size_t>::value >::type >
+{
+    static inline PyObject* from(const uint64_t& value)
+    {
+        return PyLong_FromUnsignedLongLong(value);
+    }
+
+    static inline bool to(PyObject* obj, uint64_t& value, const ArgInfo& info)
+    {
+        CV_UNUSED(info);
+        if(!obj || obj == Py_None)
+            return true;
+        if(PyInt_Check(obj))
+            value = (uint64_t)PyInt_AsUnsignedLongLongMask(obj);
+        else if(PyLong_Check(obj))
+            value = (uint64_t)PyLong_AsUnsignedLongLong(obj);
+        else
+            return false;
+        return value != (uint64_t)-1 || !PyErr_Occurred();
+    }
+};
+
+
 // --- uchar
 template<> bool pyopencv_to(PyObject* obj, uchar& value, const ArgInfo& info);
 template<> PyObject* pyopencv_from(const uchar& value);