How to add blur and background blur to both sent and received WebRTC video tracks

How do I add a blur effect to a webRTC video track? I am building a video call app using WebRTC and I need to blur the background of the person using my app and also blur all of the video coming from the other side for security reasons. (Random people can call in, so bluring all of their video is a security measure that you can turn off when you feel comfortable).

Some of the code for how I start local video capture

private var videoCapturer: CameraVideoCapturer = getCamera()

private fun getCamera(isFrontFacing: Boolean = true): CameraVideoCapturer {
    return Camera1Enumerator(true).run {
        deviceNames.find {
            if (isFrontFacing)
                isFrontFacing(it)
            else
                isBackFacing(it)
        }?.let {
            createCapturer(it, null)
        } ?: throw IllegalStateException()
    }
}


fun startLocalVideoCapture(localVideoOutput: SurfaceViewRenderer, localVideoOutputPiP: SurfaceViewRenderer? = null, localVideoOutputInAppPip: SurfaceViewRenderer? = null, isMicOn: Boolean = true) {
    localVideoOutput.setMirror(true)
    val localVideoSource = peerConnectionFactory.createVideoSource(false)
    val surfaceTextureHelper = SurfaceTextureHelper.create(Thread.currentThread().name, rootEglBase.eglBaseContext)
    (videoCapturer as VideoCapturer).initialize(surfaceTextureHelper, localVideoOutput.context, localVideoSource.capturerObserver)
    videoCapturer.startCapture(1280, 962, 24)
    localVideoTrack = peerConnectionFactory.createVideoTrack(LOCAL_TRACK_ID, localVideoSource)
    val localAudioTrack = peerConnectionFactory.createAudioTrack(
        LOCAL_AUDIO_TRACK_ID, peerConnectionFactory.createAudioSource(MediaConstraints())
    )
    localAudioTrack.setEnabled(isMicOn)
    localVideoTrack?.addSink(localVideoOutput)

    localStream = peerConnectionFactory.createLocalMediaStream(LOCAL_STREAM_ID)
    localStream.audioTracks.add(localAudioTrack)
    localStream.videoTracks.add(localVideoTrack)
    videoSender = peerConnection?.addTrack(localVideoTrack, arrayListOf(LOCAL_STREAM_ID))
    peerConnection?.addTrack(localAudioTrack, arrayListOf(LOCAL_STREAM_ID))
}

And how I receive the video:

override fun onAddStream(p0: MediaStream?) {
                super.onAddStream(p0)
                if (p0?.videoTracks?.isNotEmpty() == true) {
                    p0.videoTracks?.get(0)?.addSink(remote_view)
                    remoteVideoTrack = p0.videoTracks?.get(0)
                    callControlsViewModel.isClientCamOn.postValue(true)
                }
                if (p0?.audioTracks?.isNotEmpty() == true) {
                    remoteAudioTrack = p0.audioTracks?.get(0)
                    callControlsViewModel.isClientMicOn.postValue(true)
                }
            }