Live Action mixed with Animation

I came across this pretty cool video on Youtube the other day. Typically when watching videos you don't see too often people combine live action and animation because it's not an easy thing to do, but this video does it. The concept itself has no meaning but the actual animation is pretty good! Here's the original video:

After I watched that video, I watched how it was made. That was cooler to me than the actual video. At first the video shows how the film was originally shot compared to how they edited it. I found it interesting that they used a rubrics cube for the cube, but everything else the actor had to just guess the size. After that it goes into detail on how each animation was made. I believe the program that they used was called Blender which is a 3D modeling program. I don't really know anything about it though and why someone would use that over Maya lets say. But there were a few things that they did that we learned in class so that got me excited like tracking. Though I don't know how to do that through Blender, I do know how to use it in After Effects! Here's the video on how the first video was made. I highly suggest watching the whole thing: