Here we go, it was confirmed to be a school project for the NAD Center (a really big 3d school here in Montreal). It's a team project. Both the eagle and the baby are 100% CGI.
I only have a french article right now but they interviewed the students who created it.
http://www.dominicarpin.ca/laigle-qui-attaque-un-enfant-un-canular-du-nad-8945.html
I won't translate the whole thing but basically: Took 4 students around 400 hours to create the video and it was never meant to go viral. They simply posted their school project on youtube and now they are freaking out because journalists around the world are asking them for interviews lol.