This applies to all programs, not just iClone.
Making animation from scratch is not an easy thing.
Usually Mocap Devices are used for this (iClone or not)
Even if you have a Mocap device, you still need software to edit the movements you recorded.
However, the advantage of iClone is that even if you don't have any device, it allows you to produce a lot of animations with a little effort.
Rotating the video doesn't gain you anything anyway. Because video is not a 3D entity.
However, if you look at the video, you can produce very useful movements.
This is the simplest feature of iClone.
There are also free programs for this. You can check out the video below.
But if you do not have a Mocap device or do not know how to dance, you cannot produce dance animations from scratch with any program.
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https://www.youtube.com/yepkoo
https://dev.epicgames.com/community/profile/bxvo/Yepkoo#learning