The bottom of the capture pic does indeed look like taped mags. They are not the same (the sks pics and the video pics).
Regards the mags for the sks, the 10 rounder is fixed. There is a 20 round fixed mag as well. Both load from the top. To remove it you have to disassemble. However, - I believe- there is a drop in 10 round mag frame that you can use to replace the original 10 round mag, which then has a well into which the ak mag can be placed.
I should have bought one when I had the chance, but 400 bucks for an SKS made me balk