Usbcasts

Usbcasts allows you to use your phone as a camera. You can apply a color filter or add an image to your camera preview.

Connect your phone via USB and use OBS to display your screen on your computer.
If you download Usbcasts for mac you can have a floating webcam display that you move around your screen.

Features:
-Full-screen display of your camera
-Focus auto/manual
-Access all cameras available on your device
-Apply black and white color filter to your camera preview
-Apply custom colors on your camera preview
-Add an overlaying image and play with its opacity
-Easy and quick gestures to navigate
-Hide/show menu

Use case:
-Download Usbcasts on your device.
-Make sure you have OBS studio installed.
-Connect your phone to your computer using a USB cable
-In OBS studio create a new scene
-Add a window preview to your scene and choose your phone
-Open Usbcasts on your phone

If you have Usbcasts for mac:
-Open Usbcasts for mac
-Choose OBS virtual camera from the dropdown menu
-Open OBS virtual camera settings
-Choose your previously set scene as a source