The 'Ken Burns effect' has been helping video editors bring photos to life for over two decades. Ken pioneered a filming technique that changed documentary making forever by creating the illusion of movement using a pan and a zoom on still images. But how did this feature end up on the video editing software of every Macintosh computer? 🎧 Hear Ken Burns explain his game-changing innovation https://bbc.in/4jBcSsw | BBC World Service