Using canvas camera in extension classify images

hello, someone can helpme how to use the camera in canvas, no use the webviewer for visualization of image. i try to use my model training data for animate eyes from a picture using sprite movement but i get error trying to use backgroundbase64 image for get image from canvas. no for webviewer because i cant manipulate the movement sprite eyes.

i try using extension procamera extension canvas but i get the same error. error 6 when i try to use canvas imagebackground or link camera with canvas. the app close, i know that the creator use webviewer for some reason but exist a form to use the canvas camera video?