Any USB chip that delivers 60fps?

Any USB chip that delivers 60fps?

[Michael Conrad]

Hi, I'm looking for any USB-connected device that can give me 60fps from 
a NTSC signal.  I'm either looking for a chip+driver that support 
V4L2_FIELD_ALTERNATE (which I gather are rare) so that I can construct 
my own frames at 60Hz by blending each pair of neighboring fields, or 
ideally, to find hardware or driver that does a good job of it for me.

Why NTSC you ask? because I can find high quality cameras that work 
great in low-light scenarios, where most USB cameras fall flat.

And as a follow-up question, is it possible and how hard would it be to 
add V4L2_FIELD_ALTERNATE support to one of the EasyCap drivers? Does the 
hardware de-interlace the frames on its own or is that in software?

Thanks,
-Mike