diff --git a/samples/demo/veri.cpp b/samples/demo/veri.cpp
index dcb7155..96caf74 100644
--- a/samples/demo/veri.cpp
+++ b/samples/demo/veri.cpp
@@ -12,6 +12,9 @@ struct node
 
 node p1;
 
+// 框选到的矩形
+cv::Rect rect_sel;
+
 int main(int argc, char *argv[])
 {
   // 实例化 框选目标跟踪类
@@ -26,7 +29,7 @@ int main(int argc, char *argv[])
   sv::Camera cap;
   // cap.setWH(640, 480);
   // cap.setFps(30);
-  cap.open(sv::CameraType::WEBCAM, 4); // CameraID 0
+  cap.open(sv::CameraType::WEBCAM, 0); // CameraID 0
   // 实例化OpenCV的Mat类，用于内存单帧图像
   cv::Mat img;
   int frame_id = 0;