Aiming a Turret using Vision and an IMU/Gyro

[btcshields6]

This is sort of similar to dubiousSwain's earlier post, but less technical, and with slightly different mechanics.

My team is considering using a rotating turret-like shooter, which aims (autonomously) using vision targeting (the shooter turns, not the robot). After reading through dubiousSwain's post, I wonder if it would be better to use the camera to identify the target's distance and angular displacement, and use an IMU/Gyro to correct the angle. I don't know how that would work. I also don't know much about PID, which I saw mentioned. Does this seem like a reasonable plan?

Just so you know, we're trying to decide between these two sensors for IMU/Gyro: BNO055 or ADXRS450 (we're also open to the navX if anyone recommends that).

Thanks,

Benjamin