Capture video Macbook webcam with cpu accelerated

ffmpeg -f avfoundation -framerate 30 -video_size 1280x720 -pix_fmt uyvy422 -i "0" -c:v h264_videotoolbox -profile:v high -b:v 3M -color_range 1 /tmp/out.mp4
Captures video from webcam and encodes it using the accelerated hardware provided by videotoolbox framework. It takes about 20% cpu in a i5 2015 macbook air.
Sample Output
(after Ctrl-C)
...
Output #0, mp4, to '/tmp/out.mp4':
  Metadata:
    encoder         : Lavf57.71.100
    Stream #0:0: Video: h264 (h264_videotoolbox) ([33][0][0][0] / 0x0021), yuv420p(tv), 1280x720, q=2-31, 3000 kb/s, 30 fps, 15360 tbn, 30 tbc
    Metadata:
      encoder         : Lavc57.89.100 h264_videotoolbox
frame=  144 fps= 40 q=-0.0 Lsize=    1907kB time=00:00:04.76 bitrate=3277.4kbits/s dup=39 drop=0 speed=1.33x    
video:1906kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.073948%
Exiting normally, received signal 2.

0
2018-01-08 10:28:42

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