Theory only here, no experience.
You can attempt to get a camera stream with the user media plugin.
The user media plugin will allow you to save a snapshot, which can then be loaded into a sprite object.
You can then utilize the sprite with the drawing canvas plugin to get pixel data, with which you can parse somehow to detect your desired label. This would be the difficult part. Also this may run too slow asynchronously to be effective in realtime.
So possible yes. Image recognition is beyond me though.
I imagine a simple overlay onto a camera feed like Pokemon Go should be relatively easy.