code: def test_OverlayOntoBackgroundVideo(self):
      self.evaluate_class(
          vidaugs.OverlayOntoBackgroundVideo(
              background_path=VideoAugConfig(
                  input_file_index=1
              ).get_input_path()[0],
          ),
          fname="overlay_onto_background_video",
      )
  
imports: import json
  import random
  import unittest
  from augly import audio, video
  from augly.tests.base_configs import VideoAugConfig
  from augly.tests.video_tests.base_unit_test import BaseVideoUnitTest
  from augly.utils import VIDEO_METADATA_PATH
  from augly.utils.ffmpeg import get_conditional_for_skipping_video_tests
label_desc: Use image node_id 8 for calling the TransformsVideoUnitTest obj's underlying member method code with example usage: obj.test_OverlayOntoBackgroundVideo() without return types