Shopify E-commerce Customization

Hi We would like to do two things 1. Allow user to manually enter dimensions of their screen 2. Take picture of their screen and image ruler or something should auto detect dimensions and add to dimensions box Once the dimensions are added user can proceed with order. Can you please give me time and cost estimate for this? when you press camera icon which you will add on UI user can take picture once they take picture an image algorithm will measure the size of object inside image and will pass that to dimensions box