We recently released version 14.09 with new compositing features. Compositing for a track on the timeline has been available for some time by clicking the C button in the track header. However, there was no way to control the size, position, and opacity of the video or graphic. This could have been made available earlier as a filter with a UI that simply uses sliders and numeric fields, but that is not fun to use! We wanted to provide a way to more directly interact with the video to adjust the size and position. We needed to develop a new capability to overlay UI controls on top of the video using the same QML technology we use for the filters and timeline. Now that capability is available as the Video User Interface, or VUI for short. The new Size and Position and Text filters provide a rectangle control in the VUI.
There will be a video tutorial coming soon to explain how to use this in more detail. The new Size and Position and Opacity filters can be used with both GPU or CPU processing, but the new Text filter is only available in CPU mode. Here are the complete release notes for v14.09: