Not sure if i can describe myself, seen it somewhere, however unable find back the picture online. It's not the normal light streak where, you just open long exposure.
The one i saw was, candles and other lamp lights on the bg and fg moves as if the camera is moving, however the human subject is static and no motion blurs. It's not DI in anyway.
If you understand what i'm refering to, how do you achieve that technique?