The Shape Detection API (https://wicg.github.io/shape-detection-api/) defines detectors for faces (https://wicg.github.io/shape-detection-api/#face-detection-api) and barcodes (https://wicg.github.io/shape-detection-api/#barcode-detection-api), both of which are natively supported by the iOS Camera app. This API exposes these OS-level detectors to web applications through straight-forward interfaces.
There is a well-documented industry case where native barcode detection would help from eBay: https://medium.com/ebaytech/webassembly-at-ebay-a-real-world-use-case-ef888f38b537.
I work with SAP customers. Especially the barcode detection is highly requested by small-mid-size businesses who can't hire (expensive) iOS developers. B2B customers need to be able to decode QR and barcodes quickly and reliably in various conditions within their mobile web apps.