the image of the child does look impressive...
BUT!!!!
(there's always a but)
The video looks very much like it has 'stop motion' type editing going on ...
Don't watch the child... instead watch the net curtain on the back wall. Focus your attention on that and you will see the picture has several regular tiny little jumps in it.. a bit like a 'stop/start' effect.
This is a hand held cam that seems to have been placed on a window sill on the outside of window looking in.
The video image appears to almost rotate slightly.
The man also says he will set the camera up over night, the caption quotes that the child was captured several hours later.....
How long does a cam battery last?
Look at the door in the far right corner of the room and you can still see daylight through the crack at half height.
The child seems to be wearing something very similar to a modern day 'all in one' baby suit.
I very much doubt they had anything like that back in the 1400's.
Too much here tells me this is not real...