Use direct capture when possible

TODO

@@ -4,4 +4,5 @@ Use nvEncoder api directly? maybe with this we could copy the window opengl text
     Right now we are required to copy the opengl texture to another opengl texture first.
 Load cuda at runtime with dlopen.
 Track window damages and only update then. That is better for output file size.
-Remove cuda to cuda copy when using nvFBC if possible. ffmpeg is getting in the way.
+Remove cuda to cuda copy when using nvFBC if possible. ffmpeg is getting in the way.
+Use av_fifo.