i was wondering if i will be able to connect arduino uno with something like Open Cv on a self driving car to detect the lane or the obstacles via a webcam or a camera or mobile camera ?
No way. Think about the processing power that an Arduino has. It's not going to be able to do image processing at 16MHz with only 2K of RAM.
This is like asking if you can compete in NASCAR with your horse drawn buggy.
Get a Raspberry Pi at the very least.
Yes, your PC or Raspberry Pi runs OpenCV, and the Arduino drives the actuators.
Is there anyway to let my pc make the processing and send instruction via bluetooth to the car ?
Is there any tutorial
Bluetooth is basically a wireless serial interface.
Plenty of resources out there.