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Yes. YOu wil lend up with black bars left and right. Pillar Box
Use Clip Effects PAnel > Motion> Rotate
And that would be available in the various Premiers I have? If so, my wife loves you!
Premiere Pro and Premiere Elements can both do this.
Just be aware that it's not a magic fix. In other words, it doesn't actually correct portrait to landscape, the way Photoshop does.
In video, you're actually adding an effect -- so, once rotated, the program will need to now re-render every frame of your video. This is a process that could very well bog down your computer and take quite a while.
It can rotate MP4 without re encoding, which make the MP4 rotating progress much faster as well as keep the original video quality.
It also supports rotating MP4 as well as convert to another video format.
With this nice MP4 Rotator, it is just a piece of cake to rotate or flip all MP4 videos 90 degrees, 180 degrees, 270 degrees and more.
It also can rotate AVI, WMV, MOV, MKV, VOB, MPG and etc