The video quality is fine enough to rule out Green Heron. When the bird leans forward, you can clearly see the "rat tail"-like feathers hanging from the back of its head. You can also see a clear contrast between the dark cap/back and the paler flanks. On top of this, you can make out the pale yellow legs, which would only be present in younger Green Herons, which in turn would have yellowish bills, not black bills. As far location is concerned, Black-crowned Night-heron is considerably more widespread than Green Heron, if anything making it much more likely in that regard. I would argue that it is not hard to be sure here-- this bird fits much better for Black-crowned Night-heron than Green Heron.