No. You cannot record 4k videos.
Not at all. We have used Vivo V5s during our reviews and found that despite using for longer hours, we did not encounter any heating issues.
You will get Vivo V5s, Vivo XE100 earphone, User manual, Micro USB to USB Cable, USB Power Adapter, SIM Ejector Pin, Protective Case and Protective Film (applied) as in-the-box accessories.
Yes, you can get EMI on a debit card, conditionally, your card is eligible for it. Check with your bank (ICICI & AXIS) if your debit card is eligible or not.