code: def identity_function(
      video_path: str,
      output_path: Optional[str] = None,
      metadata: Optional[List[Dict[str, Any]]] = None,
  ) -> str:
      video_path, output_path = validate_input_and_output_paths(
          video_path, output_path
      )
  
      if output_path is not None and output_path != video_path:
          shutil.copy(video_path, output_path)
      if metadata is not None:
          func_kwargs = helpers.get_func_kwargs(
              metadata, locals(), video_path
          )
          helpers.get_metadata(
              metadata=metadata,
              function_name="identity_function",
              **func_kwargs,
          )
      return output_path or video_path
  
file_path: AugLy/augly/video/helpers/utils.py
imports: import math
  import os
  import shutil
  import tempfile
  from typing import Any, Dict, List, Optional, Tuple
  import cv2
  import ffmpeg
  import numpy
  from augly import utils
  from augly.utils.ffmpeg import FFMPEG_PATH
  from augly.video import helpers
label_desc: Use image node_id 4 for calling a global function with example usage: identity_function(video_path, output_path, metadata) and returns: unknown