Hydrangea macrophylla Nizza = 'Ranice' Macrophylla flowers on old wood. So perhaps you have a severe winter and either the old woods have died down and new woods won't flower. Or a hard frost descended on your buds when they tried to develop. Or you have pruned them. Remember, don't prune unless they are very big.
The other link shows you how to overwinter the plant to protect the whole plant and to protect the buds.
Now that you know it is macrophylla, if you watch the videos again, you will have a much better picture. You have helped me learn all this information. I didn't have a clue before I attempt your question. I am no expert. I'm nosy, bossy and am not much good at web design and hence I welcome all distractions. LOL!