for me its easier to actually see the person playing guitar because you can clearly see where their hands are and they can guide you through the song. and i agree with owlhumper(weird name lol, sorry) about the clear video. :)
yes and no, seeing someone playing it live and helping you is a lot easier but if you have a clear video of what the person is playing on the internet then you can learn it yes, just might take some more pratice
no problem :)
Thanks!