Faint Vision Effect

For about one hour I am struggling here trying to create a fainting effect.

My player is heading to a bad place and I want a blurred-decrease in his FOV. As much he advances towards death, less visibility he gonna deserve. Player is in the middle of the screen and blackness should come from outside->inside circle shaped.

But, how to do this... any tips?

Hi,

is it top down, side scroller? what have you tried already.

I've tried changing opacity and size of a mega black sprite [looking like looneytunes circles].

I've tried lots of "effects".

Now i am trying with two sprites using blend.