In order to achieve a good finish you need to cover the cake with ganache first, allow it to set and ensure your fondant is rolled out fairly thin. Once you've done what's shown on the video, you will need to do further smoothing.
by Got Cake?
by How To Cook That
by Zoes Fancy Cakes
by Joanna Stawniak
by Yuri Ostr
by fixitsamo
by Lindsay Sews