You should get the Vegas Pro 8.0 Script Developers Kit. Example 2.7 shows how to apply Event Pan/Crop. This can only be applied to an event not a track. It is not trivial as it involves using the events VideoMotion property, and setting the VideoMotionKeyframes using a VideoMotionVertex. All calculations are relative to the project resolution. It does have MoveBy and ScaleBy methods which make it a bit easier.

Here is the example I am referring to:

The following function moves a video event into view from a position off screen over a two second period.

void PanFromLeft(Vegas vegas, VideoEvent videoEvent)

{

    // create a new keyframe at 2 seconds.

    VideoMotionKeyframe key1 = new VideoMotionKeyframe(Timecode.FromSeconds(2));

    // add the new keyframe

    videoEvent.VideoMotion.Keyframes.Add(key1);

    // get the first keyframe

    VideoMotionKeyframe key0 = videoEvent.VideoMotion.Keyframes[0];

    // get the width of the project

    int videoWidth = vegas.Project.Video.Width;

    // move the first keyframe just off screen

    key0.MoveBy(new VideoMotionVertex(videoWidth, 0));

}

It is best to write a little sample script that you can change and see the effects in Vegas. This is how I learned how to use it; just by observing the behavior of different values.

~jr