You can use an iPhone as a Nintendo Switch 2 camera

Engadget

14 hours ago

Maybe you've just picked up a Nintendo Switch 2 and want to try GameChat features with your friends in Mario Kart World , but can't quite swing $55 for the official camera right now after plopping down $500 for the console and game bundle. The solution might be in your pocket.
The Switch 2 supports third-party USB-C webcams. However, you might be able to use your phone instead. YouTube channel Will It Work? has demonstrated how to use an iPhone as a camera for the console. To view this content, you'll need to update your privacy settings. Please click here and view the "Content and social-media partners" setting to do so.
Unfortunately, it's not quite as simple as opening the iPhone's Camera app, plugging a USB-C cable into both devices and setting up the phone (perhaps on a MagSafe charger) so it points at your mug. I tried that, and nope, no dice. Instead, if you plug the cable into a USB-C to HDMI adapter, and that into an HDMI capture cable and hook the daisy chain into your Switch 2, your new console should recognize your phone as a camera. This process may work for Android devices too.
Since doing this will pipe whatever's on your phone's screen into your Switch 2, you might want to use an app that hides all of the on-screen camera controls and only shows what the selfie lens or rear-facing array picks up. There are a few free options in the App Store that can do the trick. You can check that this all works by opening up the Settings on your Switch 2 and going to Controllers & Accessories > Test USB Camera.
Links in the YouTube video that demonstrates this workaround point to Amazon listings where you can pick up the two cables for $31, but you may be able to find cheaper versions. Of course, that's moot if you already have both cables. A regular capture card and HDMI to USB-C cable might work too. Naturally, if you have a USB-C webcam handy, that's an easier way to go about all this.
There is one downside to note before you use your iPhone as a Switch 2 camera, as Will It Work? points out. There may be some lag, which could affect lip sync. But if you can live with that, this might be an option for you.
There's another accessory you might already have on hand that could save you from buying an official Nintendo or third-party one. The Switch 2 fits into the Steam Deck's case. You might want to add some padding, as the Switch 2 is a smaller device than the Steam Deck and might shift around in the case otherwise, but it's still perhaps worth considering.