Add motion detection before object detection

src/config.cpp

@@ -119,6 +119,11 @@ void AppConfig::load_from_env(const char* env_path) {
     if (!ecsv.empty()) export_csv = (ecsv == "true");
     cross_csv = get_env("CROSS_CSV", output_dir + "/batch_crossings.csv");
 
+    auto mde_s = get_env("MOTION_DETECTION_ENABLED");
+    motion_detection_enabled = (mde_s == "true");
+    auto mt_s = get_env("MOTION_THRESHOLD");
+    if (!mt_s.empty()) motion_threshold = std::stof(mt_s);
+
     auto wf_s = get_env("WARMUP_FRAMES");
     if (!wf_s.empty()) warmup_frames = std::stoi(wf_s);
     auto rd_s = get_env("RECONNECT_DELAY_SEC");