Merge pull request #21504 from smirnov-alexey:as/oak_infer

[GAPI] Support basic inference in OAK backend

* Combined commit which enables basic inference and other extra capabilities of OAK backend

* Remove unnecessary target options from the cmakelist

modules/gapi/samples/oak_copy.cpp

@@ -0,0 +1,48 @@
+#include <opencv2/gapi.hpp>
+#include <opencv2/gapi/core.hpp>
+#include <opencv2/gapi/cpu/core.hpp>
+#include <opencv2/gapi/gframe.hpp>
+#include <opencv2/gapi/media.hpp>
+
+#include <opencv2/gapi/oak/oak.hpp>
+#include <opencv2/gapi/streaming/format.hpp> // BGR accessor
+
+#include <opencv2/highgui.hpp> // CommandLineParser
+
+const std::string keys =
+    "{ h help  |              | Print this help message }"
+    "{ output  | output.png   | Path to the output file }";
+
+int main(int argc, char *argv[]) {
+    cv::CommandLineParser cmd(argc, argv, keys);
+    if (cmd.has("help")) {
+        cmd.printMessage();
+        return 0;
+    }
+
+    const std::string output_name = cmd.get<std::string>("output");
+
+    cv::GFrame in;
+    // Actually transfers data to host
+    cv::GFrame copy = cv::gapi::oak::copy(in);
+    // Default camera works only with nv12 format
+    cv::GMat out = cv::gapi::streaming::Y(copy);
+
+    auto args = cv::compile_args(cv::gapi::oak::ColorCameraParams{},
+                                 cv::gapi::oak::kernels());
+
+    auto pipeline = cv::GComputation(cv::GIn(in), cv::GOut(out)).compileStreaming(std::move(args));
+
+    // Graph execution /////////////////////////////////////////////////////////
+    cv::Mat out_mat(1920, 1080, CV_8UC1);
+
+    pipeline.setSource(cv::gapi::wip::make_src<cv::gapi::oak::ColorCamera>());
+    pipeline.start();
+
+    // pull 1 frame
+    pipeline.pull(cv::gout(out_mat));
+
+    cv::imwrite(output_name, out_mat);
+
+    std::cout << "Pipeline finished: " << output_name << " file has been written." << std::endl;
+}