This video is called The Carboniferous Period.
From the Carboniferous Forest Simulation site, where you can download this program:
Carboniferous Forest Simulation
A free, interactive realtime simulation places you into a time machine and enables you to take a walk through the overgrown jungle of ferns, tree-like clubmosses and giant insects our modern civilization was founded on.
The application is currently in alpha state. This means, that the application is not complete both technical and content-wise (for example plant descriptions and sound are not complete, and animals are still missing) and it may contain errors. Nevertheless, we decided to release it as early as possible to share the development progress with you. You can also track and discuss the progress in the interesting “Making of”-thread in The Fossil Forum.
In its final version, the application will be free for personal, museum and educational use, in its current alpha version it is only free for personal use.
Any feedback, hints and reviews by paleontologists, fossil specialists, game/simulation developers and any interested persons are highly appreciated!
Please note, that you will need a pretty tough computer to run the simulation. The minimum requirement is a 2.4 GHz Core I5 processor or similar, 4 GB of RAM and a 1GB 3D graphics card (at least Geforce 560TI or similar).