On my gun, Push the slide up to expose 2 Allen wrench screws. Remove them and that allows the nail receiver to pivot away from the driver head and remove any nail that is there. Best way to help - make sure you remind everyone who uses your gun how to properly load nails - head up, angle in same plane as the driver head.
when you show us something in detail, like when you say "see that?" a blurry .75 second shot is totally useless. Why did you even bother making the video?