If you want to let your UVC A/V CVBS usb capture card or grabber card works on Andorid os, you must add the UVC driver on Android OS.
It is NOT very easy. you must own the SDK of main android SOC chip!!
My UVC A/V CVBS usb capture (grabber) card will be as an "UVC Bulk or ISO webcam"
The demo is as below "Play from UVC Bulk Camera to Android UVC Player"