Praise be to Allah, and may peace and blessings be upon the Messenger of Allah.
The basic principle regarding watching videos is permissibility, provided that they are free from prohibited content and violations of Islamic teachings.
Accordingly, there is nothing wrong with watching videos of Islamic ruqyah if they are free from prohibited elements, while taking care not to look at a sick woman without a legitimate need.
As for unlawful forms of ruqyah, it is impermissible to practice them or watch videos depicting them, because they may contain unknown expressions, seeking assistance from devils, or other prohibited practices.
Ruqyah may be performed in a language other than Arabic, provided that its meaning is understood and it is free from shirk (associating partners with Allah) and prohibited matters. However, performing it in Arabic is preferable for those who are able to do so.
Conclusion:
It is permissible to watch videos of lawful Islamic ruqyah. However, watching videos that contain prohibited forms of ruqyah or violations of Islamic teachings is forbidden, because watching prohibited content is itself impermissible.
And Allah knows best.