This clip, supposedly shot in the Dominican Republic by a different person on the same day (and from the looks of it, at roughly the same time) seems to show two different objects behind exactly the same trees; the second one appears to be the same (probably) CGI model as in the clip linked by the OP.
I’ll admit to a bit of curiosity about the sudden flurry of relatively well-exposed close-up images of ‘UFOs’ that have hit the 'Net in recent weeks, but I’m pretty sure this indeed is either one small group of people cranking out some homemade digital FX or, as others have noted, a fairly elaborate viral marketing campaign. Either way, I don’t really care all that much about who’s doing the advertising, or why.
Personally, I would give no more credence to any ‘UFO’ footage posted to YouTube than I would a typical e-mail chain letter. There’s no context, no precise indication of location, no way of verifying the identity of the person who posted, and the footage is so highly compressed that it is pretty much useless for further analysis. If somebody willing to identify themselves sends original footage to a reputable person with expertise in analyzing film or video, and if that person says there’s something interesting there, then maybe I’ll pay attention. This stuff is utterly worthless as evidence of anything, however.