Is there any idea for connecting USB camera to Raspberry pi3 and view video streaming on the ui??
Please provide with link if there is
start looking for motion or motioneye....
Take a look at webRTC:
I ran across it searching for if I could use the AIY Vision bonnet with a Pi3 instead of PiZeroW. He sets up a system that appears to do what you want if you leave out the AI.