The Camera app on your Chromebook is a video player too. It is a hidden feature, but I am going to tell you how to get it working. Send your thanks to François Beaufort because he is the one who found this!
Here is how you do it:
Type CRAZYPONY (all uppercase) in the App and you’ll get to pick a movie file you can watch (with no basic controls though). Then apply any of the available effects and take some screenshots with the multi-shot feature for instance.
Here is a sample!
Try it now!