How can I put fingerpose detection in WebXR hit testing?

Questions
1

From immersive github, folks told us that “WebXR Device API does not provide a way to grant raw camera access to the sites.”.
I am not sure if feeding video into model.estimateHands is the only way to detect fingerpose,

      const predictions = await model.estimateHands(video);

just wondering if there is any other way to detect fingerpose in WebXR to you?

MANY THANKS FOR YOUR ASSISTANCE!