In your Minecraft in real life short film you have many times were the camera moves but an CG object stays in the same place. like at the times:
I think it would be helpful if you say how you took those 3d models off the internet and added them into after effects.
I actually just released the first part of a tutorial series that will show you how to add 3D objects to your videos using Blender and Adobe After Effects. This is part 1 here: