replace demomaker with cloud-samples-data/video for video intelligenc… [(#2162)](https://github.com/GoogleCloudPlatform/python-docs-samples/issues/2162)
replace demomaker with cloud-samples-data/video for video intelligenc… [(#2162)](https://github.com/GoogleCloudPlatform/python-docs-samples/issues/2162)

* replace demomaker with cloud-samples-data/video for video intelligence samples

* flake

googleapis/python-videointelligence,googleapis/python-videointelligence