No. Redmi 6 does not have the IR blaster support.
Yes, Redmi 6 does have a fingerprint scanner. It also supports the face unlock.
Yes, Redmi 6 does have the FM radio support.
You can record up to 1080p resolution videos with Redmi 6.
If your budget absolutely can’t exceed the Rs. 8,000 mark, go with the Redmi 6 without any concerns whatsoever.