As @Gunner says, most garage door openers operate from mains voltage. They require quite a bit of torque to lift the weight of the door, even with some gearing,
They generally tend to have limit switches or sensors on the drive mechanism to ensure that the mechanism stops at the correct point and doesn’t burn the motor out. There may also be safety mechanisms, manual open/close switches and some sort of remote control system.
If you’re planning to build your own using a DC motor then that will be quite a substantial project and the Blynk bit of the process will be fairly insignificant.
If you have an existing opener that you want to add Blynk to then you should search the forum for Garage Door Opener. There are several projects that others have built and shared, and numerous questions from people at various stages of similar projects.
Searching for DC Motor Control will give you information about robotics projects using PWM motor control, but these aren’t relevant to a high power DC motor or any type of AC motor.