Hide Camera Area When Capture Photo From Webcam ASP.NET

Hi all, I'm developing a website for my store, this site like this:

- The customers will choose one of 4 satisfaction level icons.
- Take a photo of them, but they wouldn't see them and don't know they had been captured.
- The datetime, the level chosen and their photo will be saved to a folder.

I had been finished 90% and there're 2 issues I can't do:
1. Hide 2 areas: Camera area and Canvas area.
2. CapturePhoto button will be compined in satisfaction button. I mean no need capture button, only satisfaction button will take and save photo.

So please help me to do these, thank you so much!