If  you just  turn UVC webcam into HDMI OUTPUT & UVC webam bypass output, you can buy economic product as below

UVC-HDMI dual mode adapter 

https://livestream.qdm.tw/uvc-hdmi-dual-converter

USB webcam streaming adapter is also called usb webcam docking station.

it can connect a uvc video device and extend uvc function be powerful 

( eg: Logitech webcam or aem mini pro)

and then turn it into HDMI output, record , USB3.0 UVC bypass  and live streaming on iOS . 

HDMI output / record / uvc out / live streaming on iOS  at the same time !!

Product spec:

1. USB WEBCAM INPUT:

  Ⅰ .support UVC1.1 ~UVC1.5 version .

  Ⅱ. uvc resolution input is up to 1080p 30 30fps mjpg or 5fps YUV . 

  Ⅲ. USB2.0 UVC. (your uvc device must be comaptible for USB2.0 mode)

  Ⅳ. support UAC adio sampling : 16 , 32, 44.1, 48, 96 KHZ

2. Power : DC 5V @ 600mA ~ 1000mA ( depend on usb webcam or working status)

3. USB storage:  exfat , 1920x1080p 30fps up to 40000kbps

4. UVC output:  USB3.0 UVC /UAC  output . up to 1920x1080p 60fps mjpeg / yuv

     uvc video latency: UVC device latency + 130 ms 

5. HDMI output: 1920x1080p 30/24/25 fps 

   HDMI video laency :  UVC device latency + 100ms 

6. live streaming on iOS :  app " medialink switcher " or " uvcplayer "

     iOS local streaming video latency: UVC device latency + 100ms 

7. video bit rate : 3000~ 40000 kbps @ h.264 encoding engine. 

    audio AAC encoding bit rate:128 kbps

8. RTC: when power off, it still understand time clock

9. web URL control interface. 

    use browswer to setting parameter by iOS connector 

10. Support iOS VLC Player

    you can develop your own app that is like iOS VLC

   http://172.20.13.168/live.flv

iOS VLC: 

USB WEBCAM INPUT compatible 

Performence test:

1.  record function: video and audio is always sync  for 6 hours above. 

   the below video is record file 

    https://mega.nz/file/fEwyRKaR#eQoeSvcYkRsQ_xaBy9XrHz7s10xaxOSG-TlpWeDXn6I  

2. video latency test. 

     usb3.0 uvc output :

      total video latency = atem mini pro latency (120ms) + adapter latency (100ms) =220ms

     iOS local video latency : below 100ms

    https://youtu.be/RRs00rtlhiI?t=96

application 1:  connect to USB-C output of atem mini pro 

1.  it just can record the UVC output PGM video, 

     it can not record all of channel hdmi video 

2.  when you connect my adapter, atem will be UVC output. 

     For internal atem mini (pro) record function, it will disappear

     atem mini (pro) will be UVC output mode. 

atem mini usb-c be PGM HDMI mutliview HDMI / record / uvc out at the same time

this usb-c adapter is designed for atem mini series.

it can turn usb-c of atem mini (pro) into

1. PGM hdmi

2. it can connect USB flash card and record

3. connect to iOS and streaming

4. USB3.0 UVC bypass mode

application 2:  let any USB webcam be powerful 

your usb webcam DO NOT connect a PC!!

your webcam will be hdmi output / record / live streaming on iOS and USB webcam bypass output . 

  USB document camera for education use 

  when USB document camera connect to this adapter,  it will be powerful 

1.  HDMI output: connect to classroom tv monitor

2.  livestreaming on iOS:  facebook live or youtube live on iPad

3. record on usb flash card. 

4. USB webcam bypass output: it can do zoom / google meet video conference. 

USB microscope application