Glossary: Dolly zoom shot
A shot in which the camera dollies in while zooming out or the camera dollies out while zooming in. As a result the background of the shot appears to grow closer while the foreground remains the same size (or vice-versa).
In the sequence below, notice the position of the yellow car: though Jimmy and Henry stay in the same position in the frame, the background seems to move closer to them.
From GoodFellas
Frame 1: Dolly zoom shot Frame 2: Dolly zoom shotFrame 3: Dolly zoom shot