If you were already interested in, the Nvidia Shadowplay captures your full screen games to 1920*1080/60fps AVI without torturing HDDs or CPUs.
I'd tried some PC or Console Emulator and it works great. Almost forget existed screen capturing programs before. But not in DOSBOX.
I did tried editing config files make video output to diret3d but no way. Funny thing is shadowplay captures even directDraw emulator.(BlueMSX)

I wish I was ignorant so didnt do that but you did. Anyone tried shadowplay for capturing DOSBOX?