No, these are not suitable for a webcam.
av1 and av2 are just two sets of "audio / video" inputs. I am sue they each are yellow, red and white. Yellow is for what's called a Composite Video input, an analog signal that contains all required parts of the video information on one line. Red is the Right side of stereo audio, White is Left.
Component1 and 2 are two sets of a different signal system. The three jacks for these are all different parts of the video signal, but they all are analog signals also. Green is for the Y signal, Red for Pr, Blue for Pb. Together these three signals can provide a higher-quality video feed than a Composite Video signal system. A Component Video system carries only video information, so when using that...