feat(ios): add blurIntensity support for PiP video call view

[jedagen]

Summary

• Adds a blurIntensity option (0.0–1.0) to the iosPIP prop that overlays a variable-intensity UIVisualEffectView on the SampleBufferVideoCallView
• Allows apps to blur the PiP camera feed for privacy (e.g. during screen sharing) without disabling the camera entirely
• Uses UIViewPropertyAnimator with fractionComplete to support any blur level between 0 (off) and 1 (full)
• Defaults to 0 (no blur) when not specified — no breaking change

Usage

<VideoTrack
  iosPIP={{
    startAutomatically: true,
    stopAutomatically: true,
    preferredSize: { width: 9, height: 16 },
    blurIntensity: 0.8,
  }}
/>

Motivation

When an app needs to blur the local camera for privacy (e.g. hiding sensitive content during screen share), the blur overlay rendered in React Native (BlurView) is invisible to the native AVPictureInPictureController — PiP only captures the SampleBufferVideoCallView's video layer. This means the PiP window shows the raw unblurred camera feed even when the in-app view is blurred.

The only workaround without this change is to disable the camera entirely when blur is needed, which kills the PiP window.

Changes

File	Change
SampleBufferVideoCallView.h	Added blurIntensity property (CGFloat)
SampleBufferVideoCallView.m	UIVisualEffectView + UIViewPropertyAnimator with variable fractionComplete
PIPController.h	Added blurIntensity property
PIPController.m	Forwards blurIntensity to SampleBufferVideoCallView
RTCVideoViewManager.m	Reads blurIntensity from iosPIP dict

Test plan

• Set iosPIP={{ blurIntensity: 1.0, ... }} — PiP should show fully blurred feed
• Set blurIntensity: 0.5 — PiP should show partially blurred feed
• Set blurIntensity: 0 — PiP should show clear camera feed
• Toggle blur while PiP is active — overlay should appear/disappear

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