Grab video through usb video grabber

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Grab video through usb video grabber

i have usb video grabber which i want to use for my flame recognition
system. i want to make sure that i have connected to the right usb
device.. so i want to modify opencv so that i can connect to my usb
using vendor and product id and also how can i get the video through
the device.. i am new to this.. i have used opencv before with face
recognition system, but having trouble with camera..

the device i used is

can anyone please let me know any tips or how to use it..