CC Vector Blur is a blur effect that can’t really work to its full potential on its own. It needs other layers to help do the work.
I originally thought the vector blur would work as a similar feature as Reel Smart Motion Blur, but it does not. Vector here does not mean vector like in Illustrator graphics, but as direction and velocity. CC Vector Blur looks to a reference layer that is black and white, and finds patterns within gradients and aligns the blur to match them.
I have created 2 gradient examples as well as used the image itself to blur.
Vector Blur works well with the source layer being a gradient layer, from black to white. There are multiple ways to achieve this.
There are some various types of methods the vector blur will be achieved.
Use this control to select how the vector field will be defined by the values in
the chosen Vector Map. Choose one of the following options from the popup
Natural: Vector field is formed from slopes in the Vector Map from which values define height. Ridge Smoothness and steepness in the Vector Map affect vector length and thereby also blur length.
Constant Length: Same as Natural, but with straight blur strength, i.e. not fading.
Perpendicular: Same as Natural, but with perpendicular vectors. Vectors don’t point up and down the slopes, instead they point along the slopes, around hills.
Direction Center: Vector field assumes directions from the values of the Vector Map. High and low values point in different directions. Vector lengths do not vary. Blurs in both directions from the center of the vectors.
Direction Fading: Same as Direction Center except this only blurs in the (one) direction of the vectors.
Amount: Use this control to determine how far along the vector field blur is applied. In some Types, the vectors have individual length. This affects the actual blur length.
Angle Offset: Use this control to offset (rotate) the angle of the vector field.
Ridge Smoothness/Revolutions (Supervised): For non-directional blur types, use this control to adjust the smoothness of the ridges, or how steep the slopes appear, in the vector field. For directional blur types, use this control to determine how many revolutions the vector field will twist.
Vector Map: Use this pop-up to define a Vector Map from which the vector field will be defined. For example, selecting a layer containing animated Fractal Noise can produce very interesting effects.
Property: Use this pop-up menu to select the channel information on which to base the vector field on. Choose one of the following options: Red, Green, Blue, Alpha, Luminance, Lightness, Hue or Saturation.
Map Softness: Use this control to determine the softness (or blurring) of the vector field. Higher Map Softness values will remove small details and make the blur appear smoother.
(Taken from the CCfx HD 1.7.1 Manual)