Correct; part of Art 13 of the Third Geneva convention reads "Likewise, prisoners of war must at all times be protected, particularly against acts of violence or intimidation and against insults and public curiosity."
Parading them through the streets would certainly be a violation of that.
Restraining or binding hands is generally no problem, as long as it's done humanely and not as punishment. Detainees in Afg would routinely be zipcuffed, with blacked out goggles & ear defenders put on them; nothing wrong with that as long as it's done for security reasons and not as punishment. IE you couldn't leave someone like that for days, but securing them for a few hours while they are evacuated back through the system to custody is no problem. Restraining the hands of prisoners who have long since been disarmed and are firmly under the control of dozens of armed soldiers seems needlessly humiliating, and unnecessary, but I don't think it crosses the line into war crime.