fix warnings (#3330)

Author: ivikhrev

demos/interactive_face_detection_demo/cpp_gapi/main.cpp

@@ -431,7 +431,6 @@ int main(int argc, char *argv[]) {
         std::shared_ptr<ImagesCapture> cap = openImagesCapture(FLAGS_i, FLAGS_loop);
         const auto tmp = cap->read();
         cap.reset();
-        cv::Size frame_size = cv::Size{tmp.cols, tmp.rows};
         cap = openImagesCapture(FLAGS_i, FLAGS_loop, read_type::safe, 0, FLAGS_limit);
         /** ---------------- The execution part ---------------- **/
         stream.setSource<custom::CommonCapSrc>(cap);

demos/pedestrian_tracker_demo/cpp/src/tracker.cpp

@@ -245,7 +245,7 @@ void PedestrianTracker::SolveAssignmentProblem(
 
     size_t i = 0;
     for (size_t id : track_ids) {
-        if (res[i] < (int)detections.size()) {
+        if (res[i] < detections.size()) {
             matches->emplace(id, res[i], 1 - dissimilarity.at<float>(i, res[i]));
         } else {
             unmatched_tracks->insert(id);

demos/text_detection_demo/cpp/include/cnn.hpp

@@ -30,6 +30,7 @@ class Cnn {
     const std::string m_deviceName;
     ov::Core& m_core;
     cv::Size m_new_input_resolution;
+    bool use_auto_resize;
     int m_channels;
     cv::Size m_input_size;
     std::string m_input_name;
@@ -40,5 +41,4 @@ class Cnn {
 
     double m_time_elapsed;
     size_t m_ncalls;
-    bool use_auto_resize;
 };