Add zlmediakit.

Main/ImageUtilities.cpp

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+#include "ImageUtilities.h"
+#include <opencv2/opencv.hpp>
+
+namespace ImageUtilities {
+void NV21ToBGR24(const uint8_t *nv21Data, uint8_t *bgr24Data, int width, int height) {
+    cv::Mat nv21Image(height + height / 2, width, CV_8UC1, const_cast<unsigned char *>(nv21Data));
+    cv::Mat bgrImage(height, width, CV_8UC3, bgr24Data);
+    cv::cvtColor(nv21Image, bgrImage, cv::COLOR_YUV2BGR_NV21);
+}
+} // namespace ImageUtilities