Can external cameras be used by Hangouts and other apps?

[islevegan]

Let's say someone had one of these "lens cameras" for smartphones:

kodak_sl10b_pixpro_aspheric_hd_zoom

sony_dsc_qx10_b_dsc_qx10_digital_camera

sony_dsc_qx30_digital_camera_module

Sony DSC-QX100 Digital Camera Module for Smartphones

or the upcoming

olympus air a01

Could such a device be used as a camera in hangouts and other apps like that? Maybe Skype, etc? If yes, would the audio from the camera work as well? Two different questions.

Thank you.