You can get the video by making a public records request to the arresting agency. Or, you can hire an attorney to do it for you and they will request it or get it in the normal course of discovery. You have many defenses that an attorney can help you with. On the other case you can easily blow your chances to beat this if it isn't handled properly. Hire an attorney or get a public defender. Don't try to be your own lawyer. Even lawyers don't do this.
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Do not delay, talk to a local lawyer who spends most of his time defending DUI charges. Do this today. There are many issues in this case. A lawyer will be able to get the evidence you need and review your options with you. Do not talk with anyone about the facts of the stop except your lawyer.
Legal disclaimer: Legal disclaimer: Patrick M. Lewis, (913) 558-3961, firstname.lastname@example.org. This answer is intended to provide general information about the justice system. It does not provide legal advice nor does it create an attorney-client relationship. It does not provide the basis for making decisions about a course of action. Legal advice requires more communication and information than is possible in this format. Many important considerations and factors need to be investigated and discussed before an attorney could give legal advice about this issue. Before making any decisions about a course of action readers are strongly encouraged to contact a lawyer and secure an attorney-client relationship. Readers must also understand that this format does not provide for confidential communication.