Restore video function can only be used for movie that export for conversion. When such a movie is put in Timeline, you can click to do color restoration as follow: And the effect can be showed in the media player.
Brightness: Drag the Brightness adjusting bar to adjust the brightness of the movie clip.
Contrast: Drag the Contrast bar to adjust the contrast of the movie clip.
Saturation: Drag the Saturation bar to adjust the saturation.
Some settings about video restoration.
Reset: Click to reset to default values.
Apply to Current Movie: Get the current movie applied to the changed effect.
Apply to All Movies: Get all the movies applied to the changed effect.