Your question is a pretty broad and really needs more detail. When dealing with drivers knowing the underlying OS is essential. Linux, the OS I am most familiar with, uses a Video API called Video for Linux (video4linux). The next step would be a trip to CPAN to see if anyone has written Perl Modules to help you access the video API your OS uses.

You state you want to use Flash to stream captured video. Flash has its own mechanisms for accessing video, in fact a video encoder was recently released by Macromedia so you may be able to skip Perl altogether and solve your problem directly with Flash.

Good Luck

PS.. if you do find some Perly solutions please come back and share them with us. I for one would be interested since I too have Brooktree 848 based video capture card in my box.