Website (or else) to find already marker green screen animation (if possible free)

Not exactly sure where to put that, but I wan’t to start learning green screen in Blender, thing I’ve never touched before, so I’m looking for some animation already made for exercise. :slightly_smiling_face:
I can find free or paid green screen video on website, but I can’t find any with marker already around it, so I could use camera tracking. :confused:

Have you any idea / website / application to find video pre-made with marker already added on the scene (if possible free) ? :thinking:

If you didn’t understand everyhing or I didn’t make myself clear, don’t worry asking question :upside_down_face:

:nauseated_face: :slightly_smiling_face: