Im trying to do this right now, so far i have gotten rid of the annoying red, trying to get rid of the blur, unpack the ca.pbo file in the addons directory where your arma 2 is installed... search for this onplayerkilled.sqf... i got rid of the red by changing colorcorrections to false like this,
//--- Full red
"colorCorrections" ppEffectAdjust [1, 1, 0, [0.1, 0.0, 0.0, 1], [1.0, 0.5, 0.5, 0.1], [0.199, 0.587, 0.114, 0.0]];
"colorCorrections" ppEffectCommit 0.1;
"colorCorrections" ppEffectEnable false;
sleep 0.1;
not sure about the blur, still figuring it out...
