user11789: I generally use ffmpeg for encode in h264 and also resize media
My common command is something like:
ffmpeg -i in.mov -c:v libx264 -preset ultrafast -b:v 5000k -s:v 1280x720 out.mov

I have an Nvidia GeForce 1060 card.
I also use the Zeranoe Builds or various generated with the crosscompile scripts (but i'm not very pro with it)
What i would like to know is:
1) It is possible to SCALE for example from 4k or FHD (1080p) to HD (720p) by taking advantage of GPU acceleration instead of using the normal SCALE ? It is possible also to specify if use bicubic, bilinear and so on?
2) It is possible to encode in h264 faster by taking advantage of GPU acceleration ?
And what syntax/options to specify in ffmpeg to do so.
Thanks in advance.

user22728: The answer to your second question is yes. Change -c:v libx264 to -c:v h264_nvenc.  I use those builds as well.  If you use the option -encoders you can see a list of included video and audio codecs. 
This is a good resource for encoding with FFMPEG.
See the warning on this question if you try this

11789: <p>I generally use ffmpeg for encode in h264 and also resize media</p>

<p>My common command is something like:</p>

<pre><code>ffmpeg -i in.mov -c:v libx264 -preset ultrafast -b:v 5000k -s:v 1280x720 out.mov
</code></pre>

<p>I have an Nvidia GeForce 1060 card.</p>

<p>I also use the Zeranoe Builds or various generated with the crosscompile scripts (but i'm not very pro with it)</p>

<p>What i would like to know is:</p>

<p>1) It is possible to SCALE for example from 4k or FHD (1080p) to HD (720p) by taking advantage of GPU acceleration instead of using the normal SCALE ? It is possible also to specify if use bicubic, bilinear and so on?</p>

<p>2) It is possible to encode in h264 faster by taking advantage of GPU acceleration ?</p>

<p>And what syntax/options to specify in ffmpeg to do so.</p>

<p>Thanks in advance.</p>
 22728: <p>The answer to your second question is yes. Change <code>-c:v libx264</code> to <code>-c:v h264_nvenc</code>.  I use those builds as well.  If you use the option <code>-encoders</code> you can see a list of included video and audio codecs. 
<a href="https://gist.github.com/Brainiarc7/4b49f463a08377530df6cecb8171306a" rel="nofollow noreferrer">This</a> is a good resource for encoding with FFMPEG.</p>

<p><strong>See the warning on <a href="https://stackoverflow.com/questions/44510765/gpu-accelerated-video-processing-with-ffmpeg">this question</a> if you try this</strong></p>
