The Roto node is an optimal choice if you're doing rotoscoping only - it allows you to create and edit Bezier and B-spline shapes. The toolbar on the left side of the Viewer includes point selection and manipulation, and shape creation.

     Rotoscoping is a technique used in animation and visual effects to create realistic animations by tracing over live-action footage frame by frame. The roto artist manually extracts objects or characters from each frame, creating a matte or mask. This matte is then used to separate the foreground from the background.

   Roto artists typically use specialized software to assist in the process. The software may include tools for drawing and manipulating shapes, tracking features to follow the movement of objects, and other aids to streamline the manual tracing process.

    Rotoscoping is often used when it's challenging or impractical to create animations directly. For example, complex character movements, realistic motion, or interactions with live-action elements might be best achieved through rotoscoping.

The "roto final output" is the end result after completing the entire rotoscoping process. It typically involves the seamless integration of the rotoscoped elements into a new or existing scene, ensuring that they move naturally within the animated or composited environment.

In summary, the "roto final output" represents the culmination of the rotoscoping process, where the traced elements are integrated into a final visual composition for use in animation, visual effects, or other creative projects