An external USB connected camera/mic is the best (maybe only) option.  The camera/mic assemblies are usually not interchangeable from model to model.  
Inspiron 2320 with built in camera. Is there available an up grade camera & mic that will fit in the original places for this Comp'. When on Zoom with family, they say the sound is noisy & the camera not HD. So what else would you suggest? Thanks.
Inspiron 2320 AIO Camer & Mic