Create Text Graphics with Flat-Style Padded Background Boxes
I assume you're trying to create this, from the video you linked above:




If you want to create a title template that can adjust to (almost) whatever words you type in it, you're going to have to use After Effects.
In Premiere, you can create title templates, but they're not going to adjust to whatever length of word you use.
The following link takes you to a video that offers a good run-down of the latest title tools in Premiere, with which you can create templates that look like what you have in mind -- by the way, you could achieve a similar look with the old Title Tool: create a black matte, give it an opacity of, say, 30%, and place it under your title words.