Hi previously all my questions have been answered wonderfully and in much detail, its much appreciated. But to get to the point, I have a video file and I want to blur their face only for the entire video and I know that there is a button somewhere to do motion detection and detect the movement of that object even if it goes off screen, i'm wondering if that is possible to use for effects like instead of going keyframe by keyframe to blur there face and keep the blur in sync with his face I use motion detection or something similar so it detects the area I want blurred instead of me telling it every frame that that point I want it done. any help would be appreciated and at least helping me find the motion detection options would be good thankyou.