Enabling variable time change with time remapping

1. Open 12-3.prproj
2. Open the practice sequence.
3. Adjust the height of the Video 1 track
4. Right-click the clip --> choose Show Clip Keyframes > Time Remapping > Speed
5. Move CTI to the point where the man enters the frame
6. Ctrl-click the yellow line to add a speed keyframe at this point.
7. Add another speed keyframe at 07;10, just as the car enters the frame.
8. Drag the yellow line between the 1st and 2nd keyframes down to 18%.
9. Play the clip.