Nvid is a video player for the Nspire. It is not the first such project, but it is unique in that it uses vp8 video. This allows long videos to be stored with a relatively small file size and good quality, although it results in somewhat slow playback.
Nvid supports both the Nspire CX, in full color, and the Touchpad/Clickpad in grayscale.
One example video is included, sintel.ivf.tns. To create your own videos, drag any video onto wrapper.bat in the "converter" folder. This creates a file called output.ivf.tns that can be transferred to the calculator.
Nvid does not have a file browser, so you need a version of ndless that supports file association. Run nvid.tns once to install the file association. After that, you should be able to open an ivf file and have it play.
Download here:
https://github.com/pbfy0/nvid/releases/download/v1.1/nvid.zip (https://github.com/pbfy0/nvid/releases/download/v1.1/nvid.zip)