Merge pull request #20555 from TolyaTalamanov:at/fix-compileStreaming-bug

[G-API] Extend compileStreaming to support different overloads

* Make different overloads

* Order python compileStreaming overloads

* Fix compileStreaming bug

* Replace

gin -> descr_of

* Set error message

* Fix review comments

* Use macros for pyopencv_to GMetaArgs
* Use GAPI_PROP_RW
* Not split Prims python stuff

modules/gapi/include/opencv2/gapi/gcomputation.hpp

@@ -437,11 +437,7 @@ public:
      *
      * @sa @ref gapi_compile_args
      */
-    GStreamingCompiled compileStreaming(GMetaArgs &&in_metas, GCompileArgs &&args = {});
-
-    /// @private -- Exclude this function from OpenCV documentation
-    GAPI_WRAP GStreamingCompiled compileStreaming(const cv::detail::ExtractMetaCallback &callback,
-                                                        GCompileArgs                   &&args = {});
+    GAPI_WRAP GStreamingCompiled compileStreaming(GMetaArgs &&in_metas, GCompileArgs &&args = {});
 
     /**
      * @brief Compile the computation for streaming mode.
@@ -464,6 +460,10 @@ public:
      */
     GAPI_WRAP GStreamingCompiled compileStreaming(GCompileArgs &&args = {});
 
+    /// @private -- Exclude this function from OpenCV documentation
+    GAPI_WRAP GStreamingCompiled compileStreaming(const cv::detail::ExtractMetaCallback &callback,
+                                                        GCompileArgs                   &&args = {});
+
     // 2. Direct metadata version
     /**
      * @overload

modules/gapi/include/opencv2/gapi/gstreaming.hpp

@@ -396,9 +396,11 @@ namespace streaming {
  * In the streaming mode the pipeline steps are connected with queues
  * and this compile argument controls every queue's size.
  */
-struct GAPI_EXPORTS queue_capacity
+struct GAPI_EXPORTS_W_SIMPLE queue_capacity
 {
+    GAPI_WRAP
     explicit queue_capacity(size_t cap = 1) : capacity(cap) { };
+    GAPI_PROP_RW
     size_t capacity;
 };
 /** @} */