Camera for OPI PC and RPI 0W (logitech C270 or other)

vegetablu87

Good morning all.
I have a Orange Pi Pc and Raspberry Pi Zero W.
I would like usage a camera with both (separately).

I had read that I can do it if I buy a USB Camera.
I have searching and I have see a compatibility with Camera Logitech C270.
I had read that this Camera must be powered externally. If is true, how I can do it?
Someone of you have a experience with it?
I will use this camera for programming with OpenCV.

Table of compatibilities: http://elinux.org/RPi_USB_Webcams

I must apologize for my very bad english.
Thank you.