In that it has been studied by professionals, there is little question about the authenticity of this video. But is the strangely dressed child a ghost--or, simply, a strangely dressed child? Graded A for known authenticity. Graded B for content.
Quite creepy! A ghost? My gut says no, at least not in the traditional sense of the word. The entity does not seem like a child at all to me. It seems child-like, but the arms are too long. The other thing that gives me pause is the way entity hops up onto the tree. Something 'paranormal' is definitely going on here, but I don't feel it is the ghost of a child.
I'm inclined to agree with Darlene on this one. I thought the long arms might just be long flowy sleeves, but that "child" looked like it went into that tree with a big leap like a squirrel or a lemur and scrabbled straight up the trunk.