If it senses that you've fixed your gaze on a specific location for more than a few seconds, a nose-bridge mounted HD camera will take a 50 x 50 pixel snapshot and compare it to its image database -- much like Google Goggles.
Vimeo users can search through a robust library of more than 500 Looks, dynamically see each Look applied to a frame of their own video (not a stock image), compare against their original and preview the enhanced video in real-time.