Combine the two, and you get what you see in that second recording there :)
Note that new capture mode is something experimental that Chrome is exploring. If all goes well this new mode will eventually replace the old one because it has much nicer results.
O yeah, here’s the (totally not fancy) demo that was used for this recording.
https://codepen.io/bramus/pen/GRVRjYE
The first recording was made in Chrome Stable. The second recording in Chrome Canary with Experimental Web Platform Features enabled.