Tint Filter

Enable the Tint Filter option in the Adjustment panel to apply a mono-tone color on the entire video image.

Once enabled, use the Tint Filter controls on the selected video clip as follows:

Hue: use this slider to set the mono-tone color used on the video image.
Intensity: use this slider to set the intensity of the mono-tone color. Dragging the slider right makes the colors more saturated, while dragging it left makes them less saturated.