The latest WhatsApp beta for Android has added a new feature which is the picture-in-picture (PiP) mode for video calling. As Google added native support for the PiP mode with the release of Android O developer version, you will need to have a device running Android O to make use of this feature on WhatsApp.
The feature was first spotted by @WABetaInfo which share details regarding the same on Twitter. The beta version of the app with this mode is said to be 2.17.265 which allows users to keep doing something else on their Android smartphone even if they are on an ongoing WhatsApp video call. While this is also possible on Nougat and older versions, tapping the back button hides the video and only plays the audio. This is where the PiP mode comes to the rescue and shrinks the video interface into a small window which can be placed anywhere on the display with ease.
As you can see in the screenshot above, the user is able to text on WhatsApp as the video call continues in a small window. This window can be panned around the display to place it anywhere (but only around corners) as per your need. If you will swipe down this small window, the video feed will get closed and you will continue to listen the audio like it happens on Nougat and other versions.
The feature is currently available only on WhatsApp beta and can take some time before a wide rollout to masses on the stable app version. But do note that you will need to have a device running at least Android O to use this feature unless WhatsApp goes the extra mile to write its own code to offer the picture-in-picture mode on other Android versions.