Creating more Masking points during the duration of a clip.
Is there a way you can add mask points to a mask over the duration of a clip without messing up previous keyframes? For example, I am trying to mask out a person who walks in my shot. At the beginning of the clip, I only need like 10 points but as the clip progresses and as the guy moves his arms around I need more and more points. When I first tried adding points over time the previous keyframe points went all over the place. Is there a way to solve this issue or do I just have to have a lot of points initially? Thanks in advance!