How to: Close Garage Door with blinking lights before permanent fix on sensors. 

It's happened to me a couple of times when I didn't lubricated the door in a very long time. I hit the rollers and hinges WD-40. I couldn't tell if yours is chain driven by the video but they need lubrication to. For me, after lubrication and opening and closing the door a few times. Problem solved. I lube my doors regularly now, it hasn't happened again in many years. Don't lubricate them and open and close the door 10 times in a row , you can overheat the opener and pop the circuit breaker on the unit.

Did you check to see if the sensors are out of line?