Transforming realtime video into fisheye style can be as simple as use Fisheye Video app.

Fisheye Video app that produces strong visual distortion intended to create a wide panoramic or hemispherical image. Fisheye style achieve extremely wide angles of view by forgoing producing images with straight lines of perspective, opting instead for a special mapping, which gives images a characteristic convex non-rectilinear appearance.

Click Start button to start record, and click Finish button to stop record, it is so simple.

Feature:
High-resolution: 640x480 10fps for iPhone4, 640x480 30fps for iPhone4s and iPad2, 1280x720 for The New iPad
7 filters: Contrast, Exposure, Saturation, Vignette/Scale, Red, Green, Blue. So you may create Old Film style, LOMO style and more styles
Real-time change filter values
Back and Front camera supported
Photo and Movie Supported