Copy mpashchenkov's changes

Minor refactoring

Partially address review comments

Move DX-related stuff from the sample to a default source

Simplify the default OneVPL config

Address minor review comments

Add class for the default VPL source

WIP: Add initial stub for tests with description

Removing default vpl source and minor refactoring

Refactor default files

Fix build and application crash

Address review comments

Add test on VPL + OCL interaction compared to CPU behavior

Fix test

modules/gapi/include/opencv2/gapi/ocl/goclkernel.hpp

@@ -119,6 +119,10 @@ template<typename U> struct ocl_get_in<cv::GArray<U> >
 {
     static const std::vector<U>& get(GOCLContext &ctx, int idx) { return ctx.inArg<VectorRef>(idx).rref<U>(); }
 };
+template<> struct ocl_get_in<cv::GFrame>
+{
+    static cv::MediaFrame get(GOCLContext &ctx, int idx) { return ctx.inArg<cv::MediaFrame>(idx); }
+};
 template<typename U> struct ocl_get_in<cv::GOpaque<U> >
 {
     static const U& get(GOCLContext &ctx, int idx) { return ctx.inArg<OpaqueRef>(idx).rref<U>(); }

modules/gapi/include/opencv2/gapi/streaming/onevpl/default.hpp

@@ -0,0 +1,29 @@
+// This file is part of OpenCV project.
+// It is subject to the license terms in the LICENSE file found in the top-level directory
+// of this distribution and at http://opencv.org/license.html.
+//
+// Copyright (C) 2022 Intel Corporation
+
+#ifndef OPENCV_GAPI_STREAMING_ONEVPL_UTILS_HPP
+#define OPENCV_GAPI_STREAMING_ONEVPL_UTILS_HPP
+
+#include <opencv2/gapi/own/exports.hpp> // GAPI_EXPORTS
+#include <opencv2/gapi/streaming/onevpl/cfg_params.hpp>
+#include <opencv2/gapi/streaming/onevpl/device_selector_interface.hpp>
+
+namespace cv {
+namespace gapi {
+namespace wip {
+namespace onevpl {
+
+/**
+ * @brief Provides default device selector based on config.
+ */
+GAPI_EXPORTS std::shared_ptr<IDeviceSelector> getDefaultDeviceSelector(const std::vector<CfgParam>& cfg_params);
+
+} // namespace onevpl
+} // namespace wip
+} // namespace gapi
+} // namespace cv
+
+#endif // OPENCV_GAPI_STREAMING_ONEVPL_UTILS_HPP