This is the adapter to get USB power off the mirrior:
Dongar Technologies Dash Cam Power Adapter 10-pin Type H for Select Kia/Hyundai - https://smile.amazon.com/dp/B09RRSC9XF?psc=1&ref=ppx_yo2ov_dt_b_product_details

And this is the dash cam I'm using:
Rove R2-4K Dash Cam Built in WiFi GPS Car Dashboard Camera Recorder with UHD 2160P, 2.4" LCD, 150° Wide Angle, WDR, Night Vision - https://smile.amazon.com/dp/B074JT3698?psc=1&ref=ppx_yo2ov_dt_b_product_details

If you have a grey interior, this sunglasses visor clip is what I got. https://www.amazon.com/gp/product/B0BBPVN41Z

For my Cyber Gray exterior, these door edge guards look and work great. https://www.amazon.com/gp/product/B07PPH16JX

I want more lights in the leg areas, so I got this. (CORRECTED PRODUCT LINK) https://www.amazon.com/dp/B093Q9SFLL

For our key fobs with 8 buttons, this will protect them from getting scratched up. https://www.amazon.com/gp/product/B09B7Z6W6D

If you have both iPhone and Android devices, this cable is perfect for both Android Auto and Apple CarPlay. https://www.amazon.com/gp/product/B08GMG18Q3

I got this dashcam. Has front and rear cameras, Wi-Fi access, and GPS recording. https://www.amazon.com/gp/product/B0BPLVCFPD

If you want to draw 5V power from your auto-dimming mirror for your dashcam, get this. (Not pleased that they started jacking the price ever since I got mine for $19.) https://www.amazon.com/gp/product/B09RRSC9XF

But if you want something that looks more seamless and integrated to your IONIQ 5, you can get this. https://www.amazon.com/Fitcamx-Suitable-Standard-Recording-G-Sensor/dp/B0BY2T64T9

Last, but not least, get the 79" car hood LED strip if you want to accent your IONIQ 5. This is the length you want to make sure it reaches both ends of your headlights. https://www.amazon.com/gp/product/B0BVRM48XC

This is what I did (I have a 2022):

Here is the adapter which intercepts power running to the rearview mirror. It has no adverse effect on the use of any features or buttons on the mirror.

Here's what it looks like after install.

I used a drill bit to bore out a relief in the plastic that covers the wiring. I also got a pair of 90° USB elbow cables and used one of them for the short run from the adapter to the camera.

Here is the camera, and here is a polarized lens I added to it.

https://www.amazon.com/dp/B09RRSC9XF?ref=ppx_pop_mob_ap_share

This harness taps off the wires leading to the rear view mirror (auto-dimming or homelink) and provides a single USB port. It works perfectly. It’s very easy to install; and paired with a short (6”) USB cable everything tucks cleanly into the trim around the mirror/windshield sensors.