Responding to the thread title (haven't watched the video): everything we own is a culmination of various once original 'inventions', and even those original concepts were further refinements of past ideas.
Innovation doesn't simply end when the first workable idea is made into a product - it's made better, more efficient and changes over time. Are we all using the first OSes, music players, telephones, typewriters, cars, or virtually anything? No. Would we want to? No. Good products come after an enormous amount of effort, and Apple has shown over the years it can fashion solid products.
It makes no difference to the quality of a product who created the first existing form, as with time and the right talent it can be made better. No single creative idea is wholly original, everything is a synthesis, and Apple is brilliant at synthesizing new technologies into better consumer products. The same can be said for other companies such as Google, they are all driving innovation forward. And that is what ultimately matters.