Examples of what I'm actually trying to do

This is an example of what I'm trying to achieve, but, at the end of the day, what I'm trying to do is to unify the strong point of both of these gameplays, creating a fast combat with a particular lock on system, that would actually represent (thats the main idea) how it looks during a real fight.

In this first video, there is the first person fighting system, which was available only on the PS3 version of Fight Night Round 3. What I would like to achieve is the particular lock on of this system and I would also want to achieve the speed of this game, which would keep the player constantly "on his feet". 

The second video its a fist-fight from Riddick: Escape from Butcher Bay. Even tought, this game does not have the particular "lock on system", it actually has a really good fighting system, slower than the one I'm thinking on creating. 

Another of my main goals, is to create an invisible HUD. What I mean by this is, the way the player see, will change basing on how much life, stamina, the player has. This is achieavable thanks to script and post processes.