ffmpeg -h encoder=vp9_qsv

vp9_qsv.txt

Encoder vp9_qsv [VP9 video (Intel Quick Sync Video acceleration)]:
    General capabilities: delay hybrid 
    Threading capabilities: none
    Supported hardware devices: qsv qsv qsv 
    Supported pixel formats: nv12 p010le vuyx qsv xv30le
vp9_qsv encoder AVOptions:
  -async_depth       <int>        E..V....... Maximum processing parallelism (from 1 to INT_MAX) (default 4)
  -preset            <int>        E..V....... (from 0 to 7) (default 0)
     veryfast        7            E..V.......
     faster          6            E..V.......
     fast            5            E..V.......
     medium          4            E..V.......
     slow            3            E..V.......
     slower          2            E..V.......
     veryslow        1            E..V.......
  -forced_idr        <boolean>    E..V....... Forcing I frames as IDR frames (default false)
  -low_power         <boolean>    E..V....... enable low power mode(experimental: many limitations by mfx version, BRC modes, etc.) (default auto)
  -profile           <int>        E..V....... (from 0 to INT_MAX) (default unknown)
     unknown         0            E..V.......
     profile0        1            E..V.......
     profile1        2            E..V.......
     profile2        3            E..V.......
     profile3        4            E..V.......
  -tile_cols         <int>        E..V....... Number of columns for tiled encoding (from 0 to 32) (default 0)
  -tile_rows         <int>        E..V....... Number of rows for tiled encoding (from 0 to 4) (default 0)