STM32F4 Discovery Boards and TVP7002 ADC

Hello everyone, I just found this board who seem very interesting.

It has a 32-bit microcontroller who run up to 180 MHz and can do fast GPIO at 90 MHz, have a 64 MB SDRAM, USB interface, a tft screen and I'm asking if for you this board would be able to be a VGA input with a fast ADC like the TVP7002 and maybe display it on the onboard screen or stream the data by USB ?

If not, I think to at least build an oscilloscope with it, so as the ADC seems enough to me at the begining, how many samples do you think I could do with an external ADC with this board ?