If someone really wants the closest video to what the shooter's eye actually sees, eyeglass cams are the best, IMO. I have never had any of my own, but if and when i decide to buy an action video recording camera this is the kind I will get. The camera lens is only 1 to 1 1/2" out of line with the master eye, not under the barrel by several inches. Nothing to change the dynamics of your gun .... just another pair of shooting glasses.
Google "Zetronix recording sunglasses". In case you wonder about the quality, they sell police body cameras, too.
SRH