how to create a hud of power dispute?

How to create a hud of power dispute?

How to build a Dispute system powers or press buttons in specific moments in a game? like in games:

Dbz: budokai tekaichi 3,
god of war 3,
metal gear rising Revenge
asura wrath

Follow videos I think it gets better (Ignore the sound, I only found these videos):

I would like to know how to do this one of power disputes and one to press keys at certain times of the game with a hud.

Thank you in advance if you can help me