fix unused imports

frigate/api/event.py

@@ -12,7 +12,6 @@ from pathlib import Path
 from typing import List
 from urllib.parse import unquote
 
-import cv2
 import numpy as np
 from fastapi import APIRouter, Request
 from fastapi.params import Depends

frigate/api/media.py

@@ -37,7 +37,6 @@ from frigate.camera.state import CameraState
 from frigate.config import FrigateConfig
 from frigate.const import (
     CACHE_DIR,
-    CLIPS_DIR,
     INSTALL_DIR,
     MAX_SEGMENT_DURATION,
     PREVIEW_FRAME_TYPE,