Re: Not on a Samsung S4
I've just tried this on my Note 3, and it doesn't work there either. I don't have the background camera app enabled by default but I turned it on for this and it made no difference, so I assume that Samsung have (presumably inadvertently) fixed this bug during their Touchwiz-ification process. Just as well, really, as it's unlikely Samsung would issue a fix.
Could other Reg readers with different varieties of mudblood Android give it a go and let us know how it works? From his bug report I suspect that it might only work on pure Android devices, which are of course the most likely to be patched.