I put the kext in my 10.11 folder in clover / kexts. I ran the commands and the terminal tells me there is no coremedia file. My system is what is in my profile. Z87 board with i5-4690k.
Interesting side note, if I enable integrated graphics in bios and continue to use NVIDIA card, the trailers play, but my system locks up. If I go back in bios and turn off integrated graphics, then trailers do not play.
Not sure what the issue is ... any suggestions are welcome. Thank you.
EDIT - iMac kext along with Shiki text in clover / kexts / 10.11 did the trick. After reboot, played HD content in SD. Once I ran terminal commands which reset DRM, iTunes played videos in HD. Have a GTX 960 so the additional iMac kext is what seemed to do the trick. I no longer need to use integrated graphic in addition to graphics card to get it to work (which would eventually cause my system to freeze). Thanks to all those that helped with the solution.