Google meet streaming through MediaRecorder APIs

Question

I am trying to record google meet audio and video using getDisplayMedia using media options.I am able to record my screen through getDisplayMedia but unable to record voice coming in google meet. How can I use passive recording or is there any way where I can record screen, audio and video in google meet through any mechanism or code?

navigator.mediaDevices.getDisplayMedia({audio: true,video: true});
      let mediaRecorder = new MediaRecorder(mediaStreamObj);
        let chunks = [];

        mediaRecorder.start();
        console.log(mediaRecorder.state);

        mediaRecorder.ondataavailable = function(ev) {
            chunks.push(ev.data);
        }

        setTimeout(function() {
            console.log("Stopping!");
            mediaRecorder.stop();
            console.log(mediaRecorder.state);
            mediaRecorder.onstop = (ev) => {
                let blob = new Blob(chunks, {
                    'type': 'video/mp4;'
                });
                chunks = [];
                let videoURL = window.URL.createObjectURL(blob);
                console.log(videoURL);
            }
        }, 40000);