http://wccftech.com/picture-in-picture-whatsapp-oreo/

Back in July, we reported about WhatsApp testing picture-in-picture feature for video calls. The testing was being done its beta program version, and there was no information when WhatsApp was going to make it official. Today, the instant messaging app has announced it for devices on Android 8.0 Oreo.

The latest version (v 2.17.323) of WhatsApp on Google Play Store brings the functionality to Oreo running devices. With the new PiP feature, Oreo users can now make the video call window smaller and do other tasks on the phone during the video call.