Haven't a clue of this one, if it's too blurry I understand.
CLOSED: no clue
I wonder if it is a female, Hooded Warbler. I hope someone can confirm or deny, as I've never seen one in person, but seeing pictures before this is what came to mind.
I thought that at first, it has that circle that would indicate the hood, I have seen one but the head was black.
Ditto to Chillybean on female Hooded Warbler