You want to access the video node through the scene variable. Following that example, it would be something like this:
screen = CreateObject("roSGScreen")
m.port = CreateObject("roMessagePort")
screen.setMessagePort(m.port)
scene = screen.CreateScene("VideoExample")
screen.show()
video_node = scene.FindNode("exampleVideo")
videocontent = createObject("RoSGNode", "ContentNode")
videocontent.title = "Example Video"
videocontent.streamformat = "mp4"
videocontent.url = "https://roku-webdev-opus.s3.amazonaws.com/public-videos/big+stream+trimmed.mp4"
video_node.content = videocontent
video_node.setFocus(true)
video_node.control = "play"
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