Before today, you probably haven't heard of Flutter, who are a startup company working on gesture recognition technology. Well, neither did I, but the startup has been acquired by Google.
Flutter's gesture recognition technology focused on getting it working with a standard camera interface, such as webcams. Currently, Flutter only ships a Windows and Mac app, with this software continuing to work even though it has been acquired by Google. Google must see a future in the company, hence the acquisition that might help it with its future in gesture technology.