I did. Though clearly I have not done it correctly...
from kivy.lang import Builder
from kivy.app import App
from kivy.core.video import Video
racine=Builder.load_string('''
Carousel:
direction: 'right'
BoxLayout:
orientation: 'vertical'
video:
source: http://192.168.0.13:8080/?action=stream
Label:
text: "Photo 2 : C'est beau le Cantal"
size_hint_y: 0.1