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You can use any distribution but I suggest you use the Ubuntu distribution as it is a polished release and much easier for newbies to get a grip on. Linux distributions are closely related in speed to each other, so go with a x64 machine with lots of main & video memory would be my 2c offering.

Ubuntu (aka Debian) has a good package manager that allows you to get packages you need like Opencv, Gstreamer tools libs etc. easily. Video speed is more a function of video card characteristics so the faster it is and the more on-board memory it has is all that is needed IMHO. Multi-core CPU with DDR3 or DDR4 main memory is the best.