import browser
from browser import html, document

aa = document['main']

videotag = html.VIDEO(id='video', width='320', height='240')
aa.html = ""
aa <= videotag

from javascript import JSObject
createUrl = JSObject(window.URL.createObjectURL)

def OnSuccess(stream):
  video = document['video']
  video.src = createUrl(stream)
  video.play()

browser.window.navigator.mediaDevices.getUserMedia(
    {"video": True, "audio": False}
    ).then(OnSuccess)