Many DSLR’s have a Quiet Mode. One way this is done is by separating the sound of the shutter from the slap of the mirror. When you press the shutter button
Ron Pepper and Scott Bourne discuss the various types of distortion and how to fix them including barrel and pin cushion distortion along with chromatic aberration and rolling shutter.
Whether you call it rolling shutter, sensor shake, or just Jello… the problem remains the same. The possibility of bending and distorting your image when recording video on a DSLR