You could probably make something like this with a Raspberry Pi or media center. However you would have trouble with HDCP protected content. The TVs have a chip

You could probably make something like this with a Raspberry Pi or media center. However you would have trouble with HDCP protected content. The TVs have a chip that decrypts the content from the provider (Netflix, Amazon, Hulu, etc...) Without a valid HDCP key you can't composite the two video streams to make your PIP. So you are essentially stuck with what your TV can do unless you license an HDCP key for your device. Luckily there are HDMI switches out there that can do this for you. https://www.amazon.com/Zettaguard-Wireless-Switcher-Switches-ZW410/dp/B01BV1XBIY/ref=sr_1_3?keywords=HDMI+switch+PIP&qid=1650294800&sr=8-3 https://www.amazon.com/Zettaguard-Wireless-Switcher-Switches...