Can somebody please detail the procedure ?
Have a look at the FAQ. You have to take the correct command for your hardware decoder (graphics card: nvidia/ati/Intel).
Just wanted to report this worked for me on Gigabyte Z87X-UD7-TH + AMD Radeon 7970. Thanks for posting! And big thanks to vit9696!
So you can actually watch movies in iTunes?
Tested 1st HD trailer for Batman vs. Superman before and after. Before it didn't work. After it worked.
https://itunes.apple.com/us/movie/batman-v-superman-dawn-justice/id1092464213