Currently, all DX12 video decoders on Windows use software decoding.
On the other hand, if the engine is running on DX11, developers can use this by enabling the "Hardware Decoding" option under "Experimental Features".
Licensee would like to have hardware video decoding capabilities using the Direct3D 12 Video APIs described in the following link.
[Link Removed]
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-118722 in the post.