class_docstr: Simple functionality tests. 
class_docstr_tok: ["Simple","functionality","tests","."]
code: def test_video_capture(self):
      import cv2
  
      cap = cv2.VideoCapture("SampleVideo_1280x720_1mb.mp4")
      self.assertTrue(cap.isOpened())
  
imports: import unittest
  import sys
label_desc: Use image node_id 2 for calling the OpenCVTest obj's underlying member method code with example usage: obj.test_video_capture() without return types