If it works, it would be of limited help.
It appears the GTX460 supports decoding of H.264 video (I could not find an explicit listing of its decode capabilities). It does not support encoding video.
If you want to use hardware acceleration for H.265 video, you’ll want a GTX 1050, based on the Pascal architecture, or better.
See Nvidia’s Video Encode and Decode GPU Support Matrix for details on NVDEC capabilities of Nvidia video cards.
The Plex Media Server Hardware Transcoding Cheat Sheet at elpamsoft.com has additional useful information regarding the performance of various Nvidia cards.
The GTX 460 is based on Nvidia’s Fermi architecture (Wikipedia).
According to NVIDIA FFmpeg Transcoding Guide, it supports decoding (NVDEC), but not encoding (NVENC).
NVENC started with Kepler generation cards, the successor to Fermi.
Fermi cards are not listed in Nvidia’s Video Encode and Decode GPU Support Matrix. Kepler cards are listed. They support decoding of H.264. They do not support decoding of H.265. Given Fermi is a generation older, it would not support decoding of H.265.
NVIDIA FFmpeg Transcoding Guide
All NVIDIA GPUs starting with the Kepler generation support fully-accelerated hardware video encoding, and all GPUs starting with Fermi generation support fully-accelerated hardware video decoding. As of July 2019 Kepler, Maxwell, Pascal, Volta and Turing generation GPUs support hardware encoding, and Fermi, Kepler, Maxwell, Pascal, Volta and Turing generation GPUs support hardware decoding.
