If you have a photo available of your class then scan that into a computer or if you have a digital camera then take a picture of the class and put it on your hard disk. Even if you only have access to Paint, then you can add the names of everyone in Paint using the text tool, but a better program would be something like Photoshop. Most video editing programs will allow you to insert the picture and allow you to zoom into part of it and then allow you to move it around the screen by animating it's position. Before you make your video of your class make sure you use a tripod as it will make your video more steady and professional looking.

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Better than a poke in the eye with a pointy stick any day...