Yes as long as the AMD motherbd is new enough to support concurrent use. Older ones tend to disable the onboard video when a GPU is inserted.
Newer motherbds will have a setting in the bios to disable onboard,allow both, or select which one is primiary in the Bios.
Please be aware that brand new AMD rigs supporting Ryzen will have onboard video connections but the Ryzen APU's (as opposed to Ryzen CPU's) are not out yet so those ports are currently not functional.