Hi. You talking about rottoscoppy , if there is a camera movement , which cost much more then you intent to pay initially. What is the length of your video? Frame rate?
It sure can be done with animation of mask if there is not camera movement and it will cost less.
Let me know please and we can discus all the details.
If you have any questions, please do not hesitate to ask me.
Thank you and hope to work with you in near future.
Best regards,
Ruslan
P.S. online pretty much 24/7, using best software and PC for this type of work and speak fluent english.