A while back, I invested in the Elgato Screen Link. For the purposes of capturing my mobile screen within OBS, it worked as intended.
However, that’s not the only thing the application can do. You can also use it to make your smartphone work as a wireless camera. Though I found this feature to be way more interesting, early tests melted my computer.
Now that I have a modern PC, I revisited the idea of incorporating my smartphone camera into my stream as a vlog cam.
In Third Person 
