How can I make custom video effects? I want them to appear on the LCD viewfinder in real time. For example: a horizontal flip of the sensor image. Or an effect where the hue of the colors are constantly shifting. The camera already does things like this, but they're not as cool (sepia, black&white, etc). I'm not interested in adding effects post-production, because I'm using the camera with video goggles for trippy experiences. Thanks!