Update app.py

app.py

@@ -42,7 +42,9 @@ def stream_object_detection(video, conf_threshold):
 
     iterating = True
     batch = []
-
+    width  = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH)) // 2
+    height = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT)) // 2
+    n_frames = 0
 
     while iterating:
         iterating, frame = cap.read()