code: def forward(self, x):
      x = (x - self.mean) / self.std
  
      return x
  
file_path: NeMo/nemo/collections/multimodal/speech_cv/modules/video_preprocessing.py
imports: import torch
  from torch import nn
  from nemo.collections.multimodal.speech_cv.parts.submodules.permute import Permute
  from nemo.core.classes import NeuralModule, typecheck
label_desc: Use image node_id 2 for calling the NormalizeVideo obj's underlying member method code with example usage: obj.forward(x) and returns: x