This is a Pro only feature
You can export animations as video animation files or as series of image file, one file for each frame per second of your presentation. Export an animation using the Export > Animation menu item in the File menu.
Tip: Use the Animation Export feature when you need to provide a presentation of your model to a client who does not have SketchUp or the SketchUp viewer. Or, export a video animation for post-processing in another presentation software package. Use SketchUp for simple presentations or when the customer has the SketchUp viewer.