Anything past pin 13 is going to be analog. Pin 14 would be A0. 15 would be A1 and so on. From the looks of the video it is definitely a wiring issue. I built my 8X8 matrix from scratch using my schematic and it works wonderfully. You definitley should use resistors. 8 of them to be exact. Try reversing the wiring. On your matrix where you wired pins 1-8 use 9-16 instead. Good luck.