Open Photo Booth (works in iChat, too), then selected View > Video Effects.
2More
Diseases Spread Through Water Pollution - 1 views
3More
Media Matters » The Amazing 3×5 Notecard X-Ray Machine (Free!) - 0 views
3More
DJI Osmo: A Hand-Held Stabilized 4K Camera - 0 views
Where to Find Sound Effects - 29 views
2More