Update app.py

app.py

@@ -5,7 +5,7 @@ import time
 from datetime import datetime
 from collections import deque, defaultdict
 import matplotlib.pyplot as plt
-from services.video_service import get_next_video_frame, reset_video_index
+from services.video_service import VideoService
 from services.detection_service import DetectionService
 from services.thermal_service import ThermalService
 from services.shadow_detection import ShadowDetection