Customizing ionic camera

Hi - I want to customize the default ionic camera option. I would like to do the following changes to it.

  1. Remove the preview, which shows the captured photo, along with ‘Use Photo’ or ‘Retake’ buttons.
  2. add a custom overlay on the top of camera, indicating the capture region, so that the user can keep the target with in that region
  3. If possible, auto capture the image, after few seconds(after user aligns the target with in the capture region), instead of user having to click on Capture button.

Can someone guide me on how to achieve this?

Pls let me know if you need more details.