code: def on_draw(self, event):
      gloo.clear("black")
      _, im = self.cap.read()
      self.program["texture"][...] = im
      self.program.draw("triangle_strip")
  
file_path: vispy/examples/demo/gloo/camera.py
imports: import numpy
  from vispy import app
  from vispy import gloo
label_desc: Use image node_id 3 for calling the Canvas obj's underlying member method code with example usage: obj.on_draw(event) without return types