3D Chroma Key Looping Animations for use with After Effects

We install Immersive rooms in Schools and have started using After Effects with Chroma Key. We are looking for moving 3D videos of animals and objects that we can move around the screen in After Effects. We have limed access to media from Shutterstock and have purchased some content from Pixelboom.it for this purpose.

Is this sort or work something you were able to produce? We would need the animals walking in a looped video so we can move them around the walls in the room with a multiprotection system.