For video clips that do not have Automatic Player Detection, or clips where you find missing players, can be tracked manually with the Keyframing tool.
I’ll go to the start of the clip, then use this icon to open the Keyframing Panel. I’ll choose this player to track, and I can adjust the player height and width. As I play and pause the video, I’ll move the box to follow the player. The more pauses and movements I add, the smoother the overall tracking will be. Then I’ll click OK to add the tracks to the player.
Now I can add a player visualization that will use the manual tracking I just added.