So it works? I would recommend using a socket for the matrix 
Looking at your video again, if this is an eBay type module, the matrix should be on the same side as the IC. This is how they are shown everywhere and soldering it on the opposite side will reverse everything and make it not work.
One side of the matrix has a small square plastic tab that sticks out, as in the photo. On my Parola boards I silk screen the position so that this does not happen.
