Your CPU is too old and does not support H.265 decoding, and it would appear to be the case for your GPU as well, at least for 10-bit "Main10" profile video.
Using DXVA checker you will need to be sure you have HEVC decoding, and for your particular file you will need to have the "Main10" profile as it is a 10-bit video file.
I think you might need to back off in terms of resolution or bit depth on your test video file.
For the QuickSync decoder in your CPU
From a Techreport post in 2015:
Intel graphics drivers releases aren't usually very exciting, but this one is worth pointing out. Numbered 15.36.14.4080, this update imbues Haswell and Broadwell processors with hardware acceleration support for two next-gen video formats: HEVC, also known as H.265, and Google's VP9.
What this means is that you probably need either a 4th or 5th generation Intel processor for hardware decoding. Your processor is 2nd generation, denoted by the i5-2xxx series processor number.
You are also trying to play HEVC 10-bit video, which is even more demanding.
There is a Wikipedia page detailing support video codecs and h.265 is listed as Braswell and above, it is likely that this is the manufacturer intended or "supported at release" information rather than including "we fixed it later" support.
For HEVC 10-bit you would need a Kaby Lake processor, an i5-7xxx, to be able to do full hardware decoding. Just normal HEVC (non 10-bit) would be able to be decoded by (some) earlier processors.
Your CPU is a Sandy Bridge CPU and would contain the first generation of Intel hardware video decoding and support will be limited. At the time it was designed h.265 would not have been as common or as necessary to support.
For your 970 dedicated graphics
From this Cyberlink forum post it appears that the 960 and 950 Nvidia cards report that they have this profile, but it does not work fully. My suspicion is that the video file is just too large in resolution.
On the 970 the video decoder is slightly older and as such does not support h.265/HEVC at all while the decoder in the 960 is newer and apparently should support both Main and Main10 profiles. That you have different support for video decoding within the range could be disappointing.
As a result your system is going to be falling back to full software decoding for these videos and will probably struggle to play them well.
